Delaware Administrative Code
Title 2 - Transportation
2000 - Department of Transportation
2400 - Division of Transportation Solutions
2402 - Manual on Uniform Traffic Control Devices (MUTCD)
Part 6 - Temporary Traffic Control
Chapter 6H - TYPICAL APPLICATIONS
Section 6H.01 - Typical Applications

Universal Citation: 2 DE Admin Code 6H.01

Current through Register Vol. 28, No. 3, September 1, 2024

Support:

01 Chapter 6G contains discussions of typical TTC activities. This Chapter presents typical applications for a variety of situations commonly encountered. While not every situation is addressed, the information illustrated can generally be adapted to a broad range of conditions. In many instances, an appropriate TTC plan is achieved by combining features from various typical applications. For example, work at an intersection might present a near-side work zone for one street and a far-side work zone for the other street. These treatments are found in two different typical applications, while a third typical application shows how to handle pedestrian crosswalk closures. For convenience in using the typical application diagrams, Tables 6C-1 and 6C-4 are reproduced in this Chapter as Tables 6H-3 and 6H-4, respectively.

02 Procedures for establishing TTC zones vary with such conditions as road configuration, location of the work, work activity, duration of work, road user volumes, road vehicle mix (buses, trucks, cars, motorcycles, and bicycles), and road user speeds.

03 In general, the procedures illustrated represent minimum solutions for the situations depicted. Except for the notes (which are clearly classified using headings as being Standard, Guidance, Option, or Support), the information presented in the typical applications can generally be regarded as Guidance.

Option:

04 Other devices may be added to supplement the devices and device spacing may be adjusted to provide additional reaction time or delineation. Fewer devices may be used based on field conditions.

Support:

05 Figures and tables found throughout Part 6 provide information for the development of TTC plans. Also, Table 6H-3 is used for the determination of sign spacing and other dimensions for various area and roadway types.

06 (DE Revision) Table 6H-1 is an index of the 63 typical applications. Typical applications are shown on the right-hand page with notes on the facing page to the left. The legend for the symbols used in the typical applications is provided in Table 6H-2. In many of the typical applications, sign spacings and other dimensions are indicated by letters using the criteria provided in Table 6H-3. The formulas for determining taper lengths are provided in Table 6H-4.

07 Most of the typical applications show TTC devices for only one direction.

Table 6H-1. Index to Typical Applications (Sheet 1 of 2) (Delaware Revision)

Typical Application Description	Typical Application Number
Typical Application Description	Two-Lane Conventional Road	Multi-Lane Conventional Road	Interstate, Freeway, or Expressway
Work Outside of the Shoulder (see Section 6G.06)
Work Beyond the Shoulder > 10 Feet from the Edge of the Traveled Way	TA-1	TA-3A	TA-5 or TA-5A
Work Beyond the Shoulder = 10 Feet from the Edge of the Traveled Way	TA-3	TA-3A	TA-5 or TA-5B
Off-Roadway Mowing Operations	TA-1A	TA-1B	TA-1B
Blasting Zone	TA-2	TA-2	TA-2
Work on the Shoulder (see Sections 6G.07 and 6G.08)
Work on the Shoulders	TA-3	TA-3A	TA-5 or TA-5B
Short Duration or Mobile Operation on a Shoulder	TA-4	TA-4A	TA-4A
Shoulder Work with Minor Encroachment	TA-6 (= 40 MPH) or TA-10 (> 40 MPH)	TA-33	TA-33
Work Within the Traveled Way of a Two-Lane Highway (see Section 6G.10) - also applicable to other roadway types, as noted
Road Closed with a Diversion	TA-7	TA-7	TA-7
Roads Closed with an Off-Site Detour	TA-20	TA-20	TA-20
Overlapping Routes with a Detour	TA-20	TA-20	TA-20
Lane Closure on a Two-Lane Road Using Flaggers	TA-10	-	-
Lane Closure on a Two-Lane Road with Low Traffic Volumes	TA-11 or TA-11A	-	-
Lane Diversion on a Two-Lane Road with Low Traffic Volumes	TA-11B	-	-
Lane Closure on a Two-Lane Road Using Traffic Control Signals	TA-12	-	-
Temporary Road Closure	TA-13	-	-
Haul Road Crossing	TA-14	TA-14	-
Work in the Center of a Road with Low Traffic Volumes	TA-15	-	-
Surveying Along a Two-Lane Road	TA-16	TA-35	TA-35
Mobile Operations on a Two-Lane Road	TA-17	-	-
Mobile Striping Operations on a Two-Lane Road	TA-17A or TA-17B	-	-
Work Within the Traveled Way of an Urban Street (see Section 6G.11) - also applicable to other roadway types, as noted
Lane Closure on a Minor Street	TA-18	-	-
Detour for One Travel Direction	TA-20	TA-20	TA-20
Detour for a Closed Street	TA-20	TA-20	TA-20
Work Within the Traveled Way at an Intersection and on Sidewalks (see Section 6G.13)
Lane Closure on the Near Side of an Intersection	TA-21 (= 40 MPH) or TA-33 (> 40 MPH)	TA-21 (= 40 MPH) or TA-33 (> 40 MPH)	-
Right-Hand Lane Closure on the Far Side of an Intersection	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	-
Left-Hand Lane Closure on the Far Side of an Intersection	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	-
Half Road Closure on the Far Side of an Intersection	Not applicable in Delaware	Not applicable in Delaware	-
Multiple Lane Closures at an Intersection	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	TA-23 (= 40 MPH) or TA-33 (> 40 MPH)	-
Closure in the Center of an Intersection	Not applicable in Delaware	Not applicable in Delaware	-
Closure at the Side or Center of an Intersection	TA-27	TA-27	-
Sidewalk Detour or Diversion	TA-28	TA-28	-
Crosswalk Closures and Pedestrian Detours	TA-29	TA-29	-
Work Within the Traveled Way of a Multi-Lane, Non-Access Controlled Highway (see Section 6G.12) - also applicable to other roadway types, as noted
Interior Lane Closure on a Multi-Lane Street	-	TA-30 (= 40 MPH) or TA-33 (> 40 MPH)	-
Lane Closure on a Street with Uneven Directional Volumes	-	TA-31 (= 40 MPH) or TA-33 (> 40 MPH)	-
Half Road Closure on a Multi-Lane, High-Speed Highway	-	TA-32	-
Stationary Lane Closure on a Divided Highway	-	TA-33	TA-33
Lane Closure with a Temporary Traffic Barrier	-	TA-34	TA-34
Short Duration and Mobile Operations on a Multi-Lane Road	-	TA-35 or TA-35A	TA-35 or TA-35A
Mobile Striping Operations on a Multi-Lane Road		TA-35B or TA-35C	TA-35D, TA-35E, TA-35F, or TA-35G

Table 6H-1. Index to Typical Applications (Sheet 2 of 2) (Delaware Revision)

Typical Application Description	Typical Application Number
Typical Application Description	Two-Lane Conventional Road	Multi-Lane Conventional Road	Interstate, Freeway, or Expressway
Work Within the Traveled Way of an Interstate, Freeway, or Expressway (see Section 6G.14) - also applicable to other roadway types, as noted
Rolling Road Blocks on a Limited Access Multi-Lane, Divided Highway	-	-	TA-35H
Lane Shift on a Multi-Lane, Divided Highway	-	TA-36	TA-36
Double Lane Closure on a Multi-Lane, Divided Highway	-	TA-37	TA-37
Interior Lane Closure on a Multi-Lane, Divided Highway	-	TA-37 or TA-38	TA-37 or TA-38
Median Crossover on a Multi-Lane, Divided Highway	-	TA-39	TA-39
Median Crossover for an Entrance Ramp	-	TA-40	TA-40
Median Crossover for an Exit Ramp	-	TA-41	TA-41
Work in the Vicinity of an Exit Ramp	-	TA-42	TA-42
Partial Exit Ramp Closure	-	TA-43	TA-43
Work in the Vicinity of an Entrance Ramp	-	TA-44	TA-44
Temporary Reversible Lane Using Movable Barriers	-	Not applicable in Delaware	Not applicable in Delaware
Work in the Vicinity of a Grade Crossing (see Section 6G.18)
Work in the Vicinity of a Grade Crossing	TA-46	TA-33	-

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Table 6H-3. Meaning of Letter Codes on Typical Application Diagrams (Delaware Revision)

Road Type	Distance Between Signs**
Road Type	A	B	C
Urban (low speed)*	100 feet	100 feet	100 feet
Urban (high speed)*	350 feet	350 feet	350 feet
Rural	500 feet	500 feet	500 feet
Interstate / Expressway / Freeway	1,000 feet	1,640 feet	2,640 feet

* 40 mph or less is "low speed" and over 40 mph is "high speed" on state-maintained roadways.

** The column headings A, B, and C are the dimensions shown in Figures 6H-1 through 6H-46. The A dimension is the distance from the transition or point of restriction to the first sign. The B dimension is the distance between the first and second signs. The C dimension is the distance between the second and third signs. (The "first sign" is the sign in a three-sign series that is closest to the TTC zone. The "third sign" is the sign that is furthest upstream from the TTC zone.)

Table 6H-4. Formulas for Determining Taper Length (Delaware Revision)

Speed (S)	Taper Length (L) in feet
40 mph or less	L = WS2 / 60
More than 40 mph	L = WS

Where:

L = taper length in feet

W = width of offset in feet

S = posted speed limit, or off-peak 85th-percentile speed prior to work starting, or the anticipated operating speed in mph

Notes for Figure 6H-1-Typical Application 1

Work Beyond the Shoulder Greater Than 10 Feet from the Edge of the Traveled Way

(Delaware Revision)

Guidance:

1. If the work space is in the median of a divided highway, an advance warning sign should also be placed on the left side of the directional roadway.

2. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

Option:

3. The ROAD WORK AHEAD sign may be replaced with other appropriate signs such as the SHOULDER WORK sign. The SHOULDER WORK sign may be used for work adjacent to the shoulder.

4. The ROAD WORK AHEAD sign may be omitted where the work space is behind guardrail or barrier or more than 10 feet from the edge of the traveled way.

5. For short-term, short duration or mobile operation, all signs and channelizing devices may be eliminated if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

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Notes for Figure 6H-1A-Typical Application 1A

Mowing Operations along a Two-Lane Road

(Delaware Revision)

Standard:

1. Mowing operations shall be performed during daylight hours only.

2. All equipment shall be stored in accordance with Section 6G.21.

3. The length of the work area shall be limited to 2 miles or less.

Guidance:

4. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

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Notes for Figure 6H-1B-Typical Application 1B

Mowing Operations along a Multi-Lane, Divided Highway

(Delaware Revision)

Standard:

1. Mowing operations shall be performed during daylight hours only.

2. All equipment shall be stored in accordance with Section 6G.21.

3. The length of the work area shall be limited to 2 miles or less.

4. If the mowing operation occurs within the median of a multi-lane, divided highway, advance warning signs shall be placed for traffic approaching in both directions.

5. When mowing operations are performed along multi-lane, undivided highways, advance warning signs shall be placed for traffic approaching in both directions (see Figure 6H-1A).

Guidance:

6. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

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Notes for Figure 6H-2-Typical Application 2

Blasting Zone

(Delaware Revision)

Standard:

1. Whenever blasting caps are used within 1,000 feet of a roadway, the signing shown shall be used.

2. The signs shall be covered or removed when there are no explosives in the area or the area is otherwise secure.

3. Whenever a side road intersects the roadway between the BLASTING ZONE AHEAD sign and the END BLASTING ZONE sign, or a side road is within 1,000 feet of any blasting cap, similar signing, as on the mainline, shall be installed on the side road.

4. Prior to blasting, the blaster in charge shall determine whether road users in the blasting zone will be endangered by the blasting operation. If there is danger, road users shall not be permitted to pass through the blasting zone during blasting operations.

Guidance:

5. On multi-lane, divided highways, the signs should be mounted on both sides of the directional roadways.

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Notes for Figure 6H-3-Typical Application 3

Work on the Shoulder of a Two-Lane Road

(Delaware Revision)

Guidance:

1. A SHOULDER CLOSED sign should be placed on the left side of the roadway for a divided or one-way street only if the left shoulder is affected.

Option:

2. The SHOULDER CLOSED sign may be omitted from an intersecting roadway where drivers emerging from that roadway will encounter another advance warning sign prior to the activity area.

3. For short duration operations of 60 minutes or less, all signs and channelizing devices may be eliminated if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

Standard:

4. When paved shoulders having a width of 8 feet or more are closed, at least one advance warning sign shall be used. In addition, channelizing devices shall be used to close the shoulder in advance to delineate the beginning of the work space and direct vehicular traffic to remain within the traveled way.

5. If the shoulder closure is located within a passing zone, ROAD WORK AHEAD and END ROAD WORK signs shall be placed for traffic approaching in the opposite direction.

6. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

7. If the shoulder closure is located within a no-passing zone, ROAD WORK AHEAD and END ROAD WORK signs may be placed for traffic approaching in the opposite direction based on engineering judgment.

8. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

9. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-3A-Typical Application 3A

Work on the Shoulder of a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. A SHOULDER CLOSED sign should be placed on the left side of the roadway for a divided or one-way street only if the left shoulder is affected.

Option:

2. The SHOULDER CLOSED sign may be omitted from an intersecting roadway where drivers emerging from that roadway will encounter another advance warning sign prior to the activity area.

Standard:

5. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

6. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

7. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-4-Typical Application 4

Short Duration or Mobile Operation on a Shoulder of a Two-Lane Road

(Delaware Revision)

Guidance:

1. In those situations where multiple work locations within a limited distance make it practical to place stationary signs, the distance between the advance warning sign and the work should not exceed 5 miles.

2. In those situations where the distance between the advance signs and the work is 2 miles to 5 miles, a Supplemental Distance plaque should be used with the ROAD WORK AHEAD sign.

3. Where drivers emerging from an intersecting roadway will not encounter the shadow vehicle prior to the work area, a stationary warning sign should be placed on the intersecting road.

Option:

4. The ROAD WORK NEXT XX MILES sign may be used instead of the ROAD WORK AHEAD sign if the work locations occur over a distance of more than 2 miles.

5. Stationary warning signs may be omitted for short duration or mobile operations if the work vehicle displays high-intensity rotating, flashing, oscillating, or strobe lights.

Standard:

6. If arrow boards are used for an operation on the shoulder, the caution mode shall be used.

7. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

8. Except as provided in Notes 10 and 11, the work and shadow vehicles shall be equipped with truck-mounted attenuators for operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

9. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

10. Truck-mounted attenuators may be omitted from specialized work vehicles, such as sweeper, vacuum, and pothole patching trucks, and other work vehicles that cannot support the installation of a truck-mounted attenuator.

11. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, truck-mounted attenuators may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

12. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Guidance:

13. Where adequate stopping sight distance exists to the rear, the shadow vehicle should maintain the minimum distance from the work vehicle and proceed at the same speed. The shadow vehicle should slow in advance of vertical and horizontal curves that restrict sight distance.

Option:

14. The minimum distance between the work and shadow vehicles may vary according to the terrain and the manufacturer's recommendations for the truck-mounted attenuator.

15. Additional shadow vehicles may be used in both directions to provide additional warning or to reduce vehicle speeds in advance of the work area. Law enforcement vehicles may also be used for this purpose.

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Notes for Figure 6H-4A-Typical Application 4A

Short Duration or Mobile Operation on a Shoulder of a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

2. In those situations where the distance between the advance signs and the work is 2 miles to 5 miles, a Supplemental Distance plaque should be used with the ROAD WORK AHEAD sign.

3. Where drivers emerging from an intersecting roadway will not encounter the shadow vehicle prior to the work area, a stationary warning sign should be placed on the intersecting road.

Option:

4. The ROAD WORK NEXT XX MILES sign may be used instead of the ROAD WORK AHEAD sign if the work locations occur over a distance of more than 2 miles.

5. Stationary warning signs may be omitted for short duration or mobile operations if the work vehicle displays high-intensity rotating, flashing, oscillating, or strobe lights.

Standard:

6. If arrow boards are used for an operation on the shoulder, the caution mode shall be used.

Option:

9. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

12. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Guidance:

Option:

14. The minimum distance between the work and shadow vehicles may vary according to the terrain and the manufacturer's recommendations for the truck-mounted attenuator.

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Notes for Figure 6H-5-Typical Application 5

Shoulder Closure on an Interstate, Freeway, or Expressway with a Temporary Traffic Barrier

(Delaware Revision)

Guidance:

1. RIGHT (or LEFT) SHOULDER CLOSED signs should be used on limited-access highways where there is no opportunity for disabled vehicles to pull off the roadway.

2. If drivers cannot see a pull-off area beyond the closed shoulder, information regarding the length of the shoulder closure should be provided in feet or miles, as appropriate.

3. Where drivers emerging from an intersecting roadway or entrance ramp will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road or entrance ramp.

4. The use of a temporary traffic barrier should be based on engineering judgment.

Standard:

5. If used, the temporary traffic barrier and retroreflective enhanced conspicuity panels shall comply with the provisions of Section 6F.85.

Option:

6. The barrier shown in this typical application is an example of one method that may be used to close a shoulder of a long-term project.

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Notes for Figure 6H-5A-Typical Application 5A

Shoulder Closure on an Interstate, Freeway, or Expressway for Work Beyond the Shoulder

Greater Than 10 Feet from the Edge of the Traveled Way

(Delaware Revision)

Guidance:

1. RIGHT (or LEFT) SHOULDER CLOSED signs should be used on limited-access highways where there is no opportunity for disabled vehicles to pull off the roadway.

2. If drivers cannot see a pull-off area beyond the closed shoulder, information regarding the length of the shoulder closure should be provided in feet or miles, as appropriate.

Standard:

5. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

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Notes for Figure 6H-5B-Typical Application 5B

Stationary Lane Closure for Shoulder Work Less Than or Equal to 10 Feet from the Edge of the Traveled Way on an Interstate, Freeway, or Expressway

(Delaware Revision)

Standard:

1. This TTC zone application also shall be used when work is being performed in the median or left shoulder of an interstate, freeway, or expressway. In this case, the LEFT LANE CLOSED signs and the corresponding Lane Ends (or MERGE RIGHT) signs shall be substituted.

2. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

3. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.

Support:

4. Where conditions permit, restricting all vehicles, equipment, workers, and their activities to one side of the roadway might be advantageous.

Standard:

5. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

6. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

7. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

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Notes for Figure 6H-6-Typical Application 6

Shoulder Work with Minor Encroachment on a Two-Lane, Low-Speed Road (<= 40 MPH)

(Delaware Revision)

Standard:

1. This TTC zone application shall be limited to minor roads with a posted speed limit or 85th-percentile speed less than or equal to 40 mph. For higher-speed traffic conditions, a lane closure shall be used (see Figure 6H-10).

Guidance:

2. All lanes should be a minimum of 10 feet in width as measured to the near face of the channelizing devices. Except as provided in Note 3, a lane closure (see Figure 6H-10) should be used when the operations cannot accommodate the minimum 10-foot travel lane.

Option:

3. For short-term use on low-volume, low-speed roadways with vehicular traffic that does not include longer and wider heavy commercial vehicles, a minimum lane width of 9 feet may be used.

4. Where the opposite shoulder is suitable for carrying vehicular traffic and of adequate width, lanes may be shifted by use of closely-spaced channelizing devices, provided that the minimum lane width of 10 feet is maintained (see Figure 6H-11B).

5. Additional advance warning may be appropriate, such as a ROAD NARROWS sign.

6. Temporary traffic barriers may be used along the work space.

7. The shadow vehicle may be omitted if a taper and channelizing devices are used.

8. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Standard:

9. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

Guidance:

10. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

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Notes for Figure 6H-7-Typical Application 7

Road Closure with a Diversion

(Delaware Revision)

Standard:

1. Pavement markings no longer applicable to the traffic pattern of the roadway shall be removed or obliterated before any new traffic patterns are open to traffic.

2. Temporary barriers and end treatments shall be crashworthy.

Guidance:

3. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

4. Shift areas should be illuminated at night, except in emergencies.

5. If the tangent distance along the temporary diversion is more than 600 feet, a Reverse Curve sign, left first, should be used instead of the Double Reverse Curve sign, and a second Reverse Curve sign, right first, should be placed in advance of the second reverse curve back to the original alignment.

6. When the tangent section of the diversion is more than 600 feet, and the diversion has sharp curves with recommended speeds of 30 mph or less, Reverse Turn signs should be used.

7. Advisory Speed plaques should be used only when the advisory speed is less than the posted speed limit.

8. Where the temporary pavement and old pavement are different colors, the temporary pavement should start on the tangent of the existing pavement and end on the tangent of the existing pavement.

Option:

9. On sharp curves, large arrow signs may be used in addition to other advance warning signs.

10. Delineators or channelizing devices may be used along the diversion.

11. Changes in alignment may be accomplished using horizontal curves designed for normal highway speeds in accordance with the DelDOT Road Design Manual.

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Notes for Figure 6H-8-Typical Application 8

Road Closure with an Off-Site Detour

(Delaware Revision)

Support:

1. The TTC zone application for detouring or diverting road users is shown in Figure 6H-20.

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Notes for Figure 6H-9-Typical Application 9

Overlapping Routes with a Detour

(Delaware Revision)

Support:

1. The TTC zone application for detouring or diverting road users is shown in Figure 6H-20.

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Notes for Figure 6H-10-Typical Application 10

Lane Closure on a Two-Lane Road Using Flaggers

(Delaware Revision)

Option:

1. For low-volume situations with short work zones on straight roadways where the flagger is visible to road users approaching from both directions, a single flagger, positioned to be visible to road users approaching from both directions, may be used (see Chapter 6E).

2. The ROAD WORK AHEAD and the END ROAD WORK signs may be omitted for short-duration operations.

3. A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:

4. The buffer space should be extended so that the two-way traffic taper is placed before a horizontal (or crest vertical) curve to provide adequate sight distance for the flagger and a queue of stopped vehicles.

Standard:

5. At night, flagger stations shall be illuminated, except in emergencies.

Guidance:

6. When used, the BE PREPARED TO STOP sign should be located between the Flagger symbol (or FLAGGER AHEAD) sign and the ONE LANE ROAD sign.

7. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

8. When a grade crossing exists within or upstream of the transition area and it is anticipated that queues resulting from the lane closure might extend through the grade crossing, the TTC zone should be extended so that the transition area precedes the grade crossing (see Figure 6H-46).

9. When a grade crossing equipped with active warning devices exists within the activity area, provisions should be made for keeping flaggers informed as to the activation status of these warning devices (see Figure 6H-46).

10. When a grade crossing exists within the activity area, drivers operating on the left-hand side of the normal center line should be provided with comparable warning devices as for drivers operating on the right-hand side of the normal center line (see Figure 6H-46).

11. Early coordination with the railroad company or light rail transit agency should occur before work starts (see Figure 6H-46).

Option:

12. A flagger or a uniformed law enforcement officer may be used at the upstream side of the grade crossing to minimize the probability that vehicles are stopped within 50 feet of the grade crossing, measured from both sides of the outside rails (see Figure 6H-46).

Standard:

13. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

14. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

15. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-11-Typical Application 11

Lane Closure on a Two-Lane Road with Low Traffic Volumes Using a YIELD Sign

(Delaware Revision)

Option:

1. This TTC zone application may be used as an alternate to the TTC application shown in Figure 6H-10 (using flaggers) when the following conditions exist:

a. Vehicular traffic volume is such that sufficient gaps exist for vehicular traffic that must yield.

b. Road users from both directions are able to see approaching vehicular traffic through and beyond the worksite and have sufficient visibility of approaching vehicles.

Standard:

2. This TTC zone application shall require approval from DelDOT Traffic.

Guidance:

3. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road and all-way stop control or temporary traffic control signals should be considered (see Figures 6H-11A and 6H-12).

4. All lanes should be a minimum of 10 feet in width as measured to the edge line or near face of the channelizing devices. Except as provided in Note 7, a flagger-controlled lane closure (see Figure 6H-10) should be used when the operations cannot accommodate the minimum 10-foot travel lane.

5. A yield line should be installed on the yield-controlled approach for long-term and intermediate-term closures. Existing conflicting pavement markings and raised pavement marker reflectors within the transition and activity areas should be removed.

6. Where no-passing lines are not already in place, they should be added.

Option:

7. For short-term use on low-volume, low-speed roadways with vehicular traffic that does not include longer and wider heavy commercial vehicles, a minimum lane width of 9 feet may be used.

8. Removable pavement markings may be used.

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Notes for Figure 6H-11A-Typical Application 11A

Lane Closure on a Two-Lane Road with Low Traffic Volumes Using STOP Signs

(Delaware Revision)

Guidance:

1. This TTC zone application should be used as an alternate to the TTC applications shown in Figures 6H-10 and 6H-11 based on engineering judgment.

2. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

3. All lanes should be a minimum of 10 feet in width as measured to the edge line or near face of the channelizing devices. Except as provided in Note 6, a flagger-controlled lane closure (see Figure 6H-10) should be used when the operations cannot accommodate the minimum 10-foot travel lane.

4. Stop lines should be installed for long-term and intermediate-term closures. Existing conflicting pavement markings and raised pavement marker reflectors within the transition and activity areas should be removed.

5. Where no-passing lines are not already in place, they should be added.

Option:

6. For short-term use on low-volume, low-speed roadways with vehicular traffic that does not include longer and wider heavy commercial vehicles, a minimum lane width of 9 feet may be used.

7. Removable pavement markings may be used.

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Notes for Figure 6H-11B-Typical Application 11B

Lane Diversion on a Two-Lane Road with Low Traffic Volumes

(Delaware Revision)

Option:

1. Where the opposite shoulder is suitable for carrying vehicular traffic and of adequate width, lanes may be shifted by use of closely-spaced channelizing devices.

Guidance:

2. All lanes should be a minimum of 10 feet in width as measured to the near face of the channelizing devices. Except as provided in Note 8, a lane closure (see Figure 6H-10) should be used when the operations cannot accommodate the minimum 10-foot travel lane.

3. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

4. Shift areas should be illuminated at night, except in emergencies.

5. If the tangent distance along the temporary diversion is less than 600 feet, Double Reverse Curve signs should be used instead of the upstream Reverse Curve signs and the downstream Reverse Curve signs should be omitted.

6. If the design speed of the shifting taper is 30 mph or less, Reverse Turn signs should be used.

7. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

Option:

8. For short-term use on low-volume, low-speed roadways with vehicular traffic that does not include longer and wider heavy commercial vehicles, a minimum lane width of 9 feet may be used.

Standard:

9. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

10. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

11. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-12-Typical Application 12

Lane Closure on a Two-Lane Road Using Traffic Control Signals

(Delaware Revision)

Standard:

1. All temporary traffic control signals along state-maintained roadways shall have a signal plan approved by DelDOT Traffic.

2. Temporary traffic control signals shall be installed and operated in accordance with the provisions of Part 4. Temporary traffic control signals shall meet the physical display and operational requirements of conventional traffic control signals.

3. Temporary traffic control signal timing shall be established by authorized officials. Durations of red clearance intervals shall be adequate to clear the one-lane section of conflicting vehicles.

4. When the temporary traffic control signal is changed to the flashing mode, either manually or automatically, red signal indications shall be flashed to both approaches.

5. Stop lines shall be installed with temporary traffic control signals for intermediate and long-term closures. Existing conflicting pavement markings and raised pavement marker reflectors between the activity area and the stop line shall be removed. After the temporary traffic control signal is removed, the stop lines and other temporary pavement markings shall be removed and the permanent pavement markings restored.

6. Safeguards shall be incorporated to avoid the possibility of conflicting signal indications at each end of the TTC zone.

Guidance:

7. The primary signal faces controlling vehicular traffic should be located overhead.

8. Where no-passing lines are not already in place, they should be added.

9. Adjustments in the location of the advance warning signs should be made as needed to accommodate the horizontal or vertical alignment of the roadway, recognizing that the distances shown for sign spacings are minimums. Adjustments in the height of the signal heads should be made as needed to conform to the vertical alignment.

10. All lanes should be a minimum of 10 feet in width as measured to the edge line or near face of the channelizing devices. Except as provided in Note 12, a flagger-controlled lane closure (see Figure 6H-10) should be used when the operations cannot accommodate the minimum 10-foot travel lane.

Option:

11. Removable pavement markings may be used.

12. For short-term use on low-volume, low-speed roadways with vehicular traffic that does not include longer and wider heavy commercial vehicles, a minimum lane width of 9 feet may be used.

Support:

13. Temporary traffic control signals are preferable to flaggers for long-term projects and other activities that would require flagging at night.

14. The maximum length of activity area for one-way operation under temporary traffic control signal control is determined by the capacity required to handle the peak demand.

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Notes for Figure 6H-13-Typical Application 13

Temporary Road Closure

(Delaware Revision)

Support:

1. Conditions represented are a planned closure not exceeding 20 minutes during off-peak hours.

Standard:

2. A flagger or uniformed law enforcement officer shall be used for this application. The flagger, if used for this application, shall follow the procedures provided in Sections 6E.07 and 6E.08.

Guidance:

3. The uniformed law enforcement officer, if used for this application, should follow the procedures provided in Sections 6E.07 and 6E.08.

Option:

4. A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:

5. When used, the BE PREPARED TO STOP sign should be located before the Flagger symbol (or FLAGGER AHEAD) sign.

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Notes for Figure 6H-14-Typical Application 14

Haul Road Crossing

(Delaware Revision)

Guidance:

1. Floodlights should be used to illuminate haul road crossings where existing light is inadequate.

2. Where no-passing lines are not already in place, they should be added.

Standard:

3. The traffic control method selected shall be used in both directions.

Flagging Method

4. When a road used exclusively as a haul road is not in use, the haul road shall be closed with Type 3 Barricades and the Flagger symbol (or FLAGGER AHEAD) signs covered.

5. The flagger shall follow the procedures provided in Sections 6E.07 and 6E.08.

6. At night, flagger stations shall be illuminated, except in emergencies.

Signalized Method

7. All temporary traffic control signals along state-maintained roadways shall have a signal plan approved by DelDOT Traffic.

8. When a road used exclusively as a haul road is not in use, the haul road shall be closed with Type 3 Barricades. The signals shall either flash yellow on the main road or be covered, and the Signal Ahead and STOP HERE ON RED signs shall be covered or hidden from view.

9. The temporary traffic control signals shall control both the highway and the haul road and shall meet the physical display and operational requirements of conventional traffic control signals as described in Part 4. Traffic control signal timing shall be established by authorized officials.

10. Stop lines shall be used on existing highway with temporary traffic control signals.

11. Existing conflicting pavements markings between the stop lines shall be removed. After the temporary traffic control signal is removed, the stop lines and other temporary pavement markings shall be removed and the permanent pavement markings restored.

Guidance:

12. If the signalized method is used, the primary signal faces controlling vehicular traffic should be located overhead.

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Notes for Figure 6H-15-Typical Application 15

Work in the Center of a Road with Low Traffic Volumes

(Delaware Revision)

Guidance:

1. The lanes on either side of the center work space should have a minimum width of 10 feet as measured from the near edge of the channelizing devices to the edge of the pavement or the outside edge of the paved shoulder.

2. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

3. Shift areas should be illuminated at night, except in emergencies.

4. If the design speed of the shifting taper is 30 mph or less, Double Reverse Turn signs should be used.

5. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

Option:

6. A lane width of 9 feet may be used for short-term stationary work on low-volume, low-speed roadways when motor vehicle traffic does not include longer and wider heavy commercial vehicles.

Standard:

7. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

9. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-16-Typical Application 16

Surveying Along a Two-Lane Road

(Delaware Revision)

Standard:

1. The length of the work area shall be limited to a half day's surveying operation or 1 mile, whichever is less.

2. The flaggers shall be in sight of each other or in communication with each other at all times.

Guidance:

3. Where a side road or major access point, such as a commercial, industrial, or subdivision entrance, intersects the work zone, additional flagger(s) should be located in the vicinity of the intersection(s).

4. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

Option:

5. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph. Law enforcement vehicles may be used for this purpose.

6. ROAD WORK AHEAD signs may be used in place of the SURVEY CREW signs.

7. A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:

8. When used, the BE PREPARED TO STOP sign should be located before the Flagger symbol (or FLAGGER AHEAD) sign.

Standard:

9. For short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

11. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Guidance:

12. For surveying operations along multi-lane roads, the off-roadway surveying operations should be completed first and then the applicable typical application for a shoulder closure (TA-4A) or lane closure (TA-35) should be used with the exception of the use of SURVEY WORK signs.

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Notes for Figure 6H-17-Typical Application 17

Mobile Operations on a Two-Lane Road

(Delaware Revision)

Standard:

1. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

2. Shadow and work vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

3. If an arrow board is used, it shall be used in the caution mode.

Guidance:

4. Where drivers emerging from an intersecting roadway will not encounter the shadow vehicle prior to the work area, a stationary warning sign should be placed on the intersecting road.

5. Where practical and when needed, the work and shadow vehicles should pull over periodically to allow vehicular traffic to pass.

6. Whenever adequate stopping sight distance exists to the rear, the shadow vehicle should maintain the minimum distance from the work vehicle and proceed at the same speed. The shadow vehicle should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

7. The minimum distance between the work and shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

8. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used. Law enforcement vehicles may be used for this purpose.

9. If the work and shadow vehicles cannot pull over to allow vehicular traffic to pass frequently, a DO NOT PASS sign may be placed on the rear of the vehicle blocking the lane.

10. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

Support:

11. Shadow vehicles are used to warn motor vehicle traffic of the operation ahead.

Standard:

12. Except as provided in Note 13, the work and shadow vehicles shall be equipped with truck-mounted attenuators for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

13. Truck-mounted attenuators may be omitted from specialized work vehicles, such as sweeper, vacuum, and pothole patching trucks, and other work vehicles that cannot support the installation of a truck-mounted attenuator.

14. Truck-mounted attenuators may be used for mobile operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-17A-Typical Application 17A

Mobile Striping Operations on a Two-Lane Road with a Single Convoy

(Delaware Revision)

Standard:

1. Except as provided in Figure 6H-17B (separate cone recovery convoy), a minimum of five vehicles shall be used for the mobile striping operation convoy.

2. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

3. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

4. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

5. If an arrow board is used, it shall be used in the caution mode.

Guidance:

6. Where drivers emerging from an intersecting roadway will not encounter a shadow vehicle prior to the work area, a stationary warning sign should be placed on the intersecting road.

7. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

8. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

9. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used. Law enforcement vehicles may be used for this purpose.

10. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

Support:

11. Shadow vehicles are used to warn motor vehicle traffic of the operation ahead.

Standard:

12. Shadow Vehicles 1 and 4 shall be equipped with truck-mounted attenuators for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

13. Truck-mounted attenuators may be used for mobile operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-17B-Typical Application 17B

Mobile Striping Operations on a Two-Lane Road with a Separate Cone Recovery Convoy

(Delaware Revision)

Standard:

1. A minimum of three vehicles shall be used for the initial mobile striping application convoy and a minimum of two vehicles shall be used for the cone recovery convoy.

2. The cone recovery convoy shall operate in accordance with Figure 6H-17.

3. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

4. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

5. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

6. If an arrow board is used, it shall be used in the caution mode.

Guidance:

7. The cone recovery should occur within 1 hour of the initial application or within the corresponding drying time based on ambient temperatures.

8. Where drivers emerging from an intersecting roadway will not encounter a shadow vehicle prior to the work area, a stationary warning sign should be placed on the intersecting road.

9. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

10. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

11. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used. Law enforcement vehicles may be used for this purpose.

12. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

Support:

13. Shadow vehicles are used to warn motor vehicle traffic of the operation ahead.

Standard:

14. Shadow Vehicle 2 shall be equipped with a truck-mounted attenuator for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

15. Truck-mounted attenuators may be used for mobile operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

16. Retroreflective cones may be used to supplement mobile striping operations to protect the painted lines.

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Notes for Figure 6H-18-Typical Application 18

Lane Closure on a Minor Street

(Delaware Revision)

Standard:

1. This TTC zone application shall be used only for low-speed facilities having low traffic volumes, such as subdivision streets.

Option:

2. Where the work space is short, where road users can see the roadway beyond, and where volume is low, vehicular traffic may be self-regulating.

Standard:

3. Where vehicular traffic cannot effectively self-regulate, one or two flaggers shall be used as illustrated in Figure 6H-10.

Option:

4. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

5. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

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Notes for Figure 6H-19-Typical Application 19

Detour for One Travel Direction

(Delaware Revision)

Support:

1. The TTC zone application for detouring or diverting road users is shown in Figure 6H-20.

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Notes for Figure 6H-20-Typical Application 20

Detour for a Closed Street

(Delaware Revision)

Standard:

1. All detours affecting state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

2. Before a road is closed to traffic, all necessary detour signs shall be in place along the corresponding detour route.

Guidance:

3. Under emergency conditions, personnel should be provided to ensure a safe roadway closure until proper devices are in place.

4. Proper devices should be in place within 24 hours of the start of the emergency operation.

5. Regulatory traffic control devices should be modified as needed for the duration of the detour.

6. On multi-lane streets, Detour signs with an Advance Turn Arrow should be used in advance of a turn.

7. On multi-lane, divided highways, Detour signs should be mounted on both sides of the directional roadway where adequate lateral clearance is available on the left-hand side of the roadway to accommodate the additional signs.

8. For complex or overlapping detours associated with unnumbered routes, a Street Name sign should be mounted with the Detour sign.

9. Route Sign Directional assemblies should be used for long-term detours associated with numbered routes.

10. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the road closure, additional signs should be placed on the intersecting road.

Option:

11. If the road is opened for some distance beyond the intersection and/or there are significant origin/destination points beyond the intersection, the ROAD CLOSED and DETOUR signs on Type 3 Barricades may be located at the edge of the traveled way.

12. Detour signs may be located on the far side of intersections. A Detour sign with an advance arrow may be used in advance of a turn.

13. A Street Name sign may be mounted with the Detour sign. The Street Name sign may be either white on green or black on orange.

14. Cardinal direction plaques may be used with route signs.

15. Additional temporary traffic control devices may be used for detours and road closures on multi-lane, divided highways based on engineering judgment.

Standard:

16. When used, the Street Name sign shall be placed above the Detour sign.

17. Type 3 Barricades used at the point of the road closure shall extend entirely across the closed portion of the roadway, including any corresponding shoulders.

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Notes for Figure 6H-21-Typical Application 21

Lane Closure on the Near Side of an Intersection on an Undivided, Low-Speed Road (<= 40 MPH)

(Delaware Revision)

Standard:

1. This TTC zone application also shall be used when work is being performed in the left-hand lane. In this case, the LEFT LANE CLOSED sign and the corresponding Lane Ends (or MERGE RIGHT) sign shall be substituted.

2. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

Guidance:

3. This TTC zone application should be limited to urban intersections with a posted speed limit or 85th-percentile speed less than or equal to 40 mph. For higher-speed traffic conditions, additional warning signs should be used in the advance warning area (see Figure 6H-33).

4. If the work space extends across a crosswalk, the crosswalk should be closed using the information and devices shown in Figure 6H-29.

5. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.

6. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

7. Along divided highways, advance warning signs should be omitted from the opposing direction and downstream intersecting roadways.

Option:

8. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-21A.Typical Application 21A

Turn Lane Closure on the Near Side of an Intersection on an Undivided, Low-Speed Road (. 40 MPH)

(Delaware Revision)

Standard:

1. This TTC zone application also shall be used when work is being performed in the left-hand turn lane. In this case, the LEFT TURN LANE CLOSED sign shall be substituted.

2. An arrow board shall be used when a turn lane is closed. When more than one turn lane is closed, a separate arrow board shall be used for each closed turn lane.

3. When paved shoulders having a width of 8 feet or more are closed, channelizing devices shall be used to close the shoulder in advance to delineate the beginning of the work space and direct vehicular traffic to remain within the traveled way.

4. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph. Guidance:

5. If the work space extends across a crosswalk, the crosswalk should be closed using the information and devices shown in Figure 6H-29.

6. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

7. Along divided highways, advance warning signs should be omitted from the opposing direction and downstream intersecting roadways.

Option:

8. For short duration operations along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

9. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-22-Typical Application 22

Right-Hand Lane Closure on the Far Side of an Intersection

(Delaware Revision)

Support:

1. The TTC zone application for a lane closure on the far side of an intersection is shown in Figure 6H-23.

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Notes for Figure 6H-23-Typical Application 23

Lane Closure on the Far Side of an Intersection on an Undivided, Low-Speed Road (=< 40 MPH)

(Delaware Revision)

Standard:

2. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

Guidance:

4. If the work space extends across a crosswalk, the crosswalk should be closed using the information and devices shown in Figure 6H-29.

6. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

7. Along divided highways, advance warning signs should be omitted from the opposing direction.

Option:

8. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Support:

9. The normal procedure is to close on the near side of the intersection any lane that is not carried through the intersection.

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Notes for Figure 6H-24-Typical Application 24

Half Road Closure on the Far Side of an Intersection

(Not Applicable in Delaware)

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Notes for Figure 6H-25-Typical Application 25

Multiple Lane Closures at an Intersection

(Delaware Revision)

Support:

1. The TTC zone application for closing multiple lanes at an intersection is shown in Figure 6H-23.

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Notes for Figure 6H-26-Typical Application 26

Closure in the Center of an Intersection

(Not Applicable in Delaware)

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Notes for Figure 6H-27-Typical Application 27

Closure at the Side or Center of an Intersection

(Delaware Revision)

Guidance:

1. The situation depicted can be simplified by closing one or more of the intersection approaches. If this cannot be done, and/or when capacity is a problem, through vehicular traffic should be directed to other roads or streets based on a detour plan approved by DelDOT Traffic and in accordance with Figure 6H-20.

2. Depending on road user conditions, flagger(s) or uniformed law enforcement officer(s) should be used to direct road users within the intersection (see Section 6E.07 for flagger procedures).

Standard:

3. At night, flagger and uniformed law enforcement officer stations shall be illuminated, except in emergencies.

Option:

4. A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:

5. When used, the BE PREPARED TO STOP sign should be located before the Flagger symbol (or FLAGGER AHEAD) sign.

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Notes for Figure 6H-28-Typical Application 28

Sidewalk Detour or Diversion

(Delaware Revision)

Standard:

1. When crosswalks or other pedestrian facilities are closed or relocated, temporary facilities shall be detectable and shall include accessibility features consistent with the features present in the existing pedestrian facility.

2. Pedestrian detours along state-maintained roadways shall have a pedestrian detour plan approved by DelDOT Traffic.

Guidance:

3. Where high speeds are anticipated, a temporary traffic barrier and, if necessary, a crash cushion should be used to separate the temporary sidewalks from vehicular traffic.

4. Audible information devices should be considered where midblock closings and changed crosswalk areas cause inadequate communication to be provided to pedestrians who have visual disabilities.

Option:

5. Street lighting may be considered.

6. If establishing or maintaining an alternate pedestrian route is not feasible during the project, an alternate means of providing for pedestrians may be used, such as adding free bus service around the project or assigning someone the responsibility to assist pedestrians with disabilities through the project limits.

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Notes for Figure 6H-29-Typical Application 29

Crosswalk Closures and Pedestrian Detours

(Delaware Revision)

Standard:

2. Pedestrian detours along state-maintained roadways shall have a pedestrian detour plan approved by DelDOT Traffic.

3. Temporary midblock crosswalks across uncontrolled approaches are discouraged and shall not be used on state-maintained roadways unless approved by DelDOT Traffic.

4. If approved by DelDOT Traffic, temporary midblock crosswalks across uncontrolled approaches shall be installed based on the requirements and guidelines in Parts 2 and 3.

5. Curb parking shall be prohibited for at least 50 feet in advance of the temporary midblock crosswalk.

Guidance:

6. Audible information devices should be considered where midblock closings and changed crosswalk areas cause inadequate communication to be provided to pedestrians who have visual disabilities.

7. Pedestrian traffic signal displays controlling closed crosswalks should be covered or deactivated.

Option:

8. Street lighting may be considered.

9. In order to maintain the systematic use of the fluorescent yellow-green background for pedestrian, bicycle, and school warning signs in a jurisdiction, the fluorescent yellow-green background for pedestrian, bicycle, and school warning signs may be used in TTC zones.

10. If establishing or maintaining an alternate pedestrian route is not feasible during the project, an alternate means of providing for pedestrians may be used, such as adding free bus service around the project or assigning someone the responsibility to assist pedestrians with disabilities through the project limits.

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Notes for Figure 6H-30-Typical Application 30

Interior Lane Closure on a Multi-Lane, Undivided, Low-Speed Road (<= 40 MPH)

(Delaware Revision)

Guidance:

1. This TTC zone application should be limited to low-speed, low-volume urban streets with a posted speed limit or 85th-percentile speed less than or equal to 40 mph. For higher-speed traffic conditions, additional warning signs should be used in the advance warning area (see Figure 6H-33).

Option:

2. The closure of the adjacent interior lane in the opposing direction may not be necessary, depending upon the activity being performed and the work space needed for the operation.

Standard:

3. When only the left lane is closed on undivided roads, channelizing devices shall be placed along the center line as well as along the adjacent lane.

4. When a side road intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

5. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

6. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

8. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-31-Typical Application 31

Lane Closure on a Multi-Lane, Undivided, Low-Speed Road (<= 40 MPH)

with Uneven Directional Volumes

(Delaware Revision)

Standard:

1. This TTC zone application shall be used only when the vehicular traffic volume indicates that two lanes of vehicular traffic shall be maintained in the direction of travel for which one lane is closed.

Option:

2. The procedure may be used during a peak period of vehicular traffic and then changed to provide two lanes in the other direction for the other peak.

Guidance:

3. This TTC zone application should be limited to low-speed, low-volume urban streets with a posted speed limit or 85th-percentile speed less than or equal to 40 mph. For higher-speed traffic conditions, additional warning signs should be used in the advance warning area (see Figure 6H-33).

4. Conflicting pavement markings should be removed for long-term projects. For short-term and intermediate-term projects where this is not practical, the channelizing devices in the area where the pavement markings conflict should be placed at a maximum spacing of 1/2 S feet where S is the speed in mph. Temporary markings should be installed where needed.

Option:

5. For short-term stationary work, lanes may be delineated by channelizing devices or removable pavement markings instead of temporary markings.

Guidance:

6. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

7. Shift areas should be illuminated at night, except in emergencies.

8. If the lane shift has curves with recommended speeds of 30 mph or less, Reverse Turn signs should be used.

9. If the tangent distance along the temporary diversion is less than 600 feet, a Double Reverse Curve sign should be used instead of the upstream Two Lane Reverse Curve sign and the downstream Two Lane Reverse Curve sign should be omitted.

Standard:

10. The number of lanes illustrated on the Reverse Curve or Double Reverse Curve signs shall be the same as the number of through lanes available to road users, and the direction of the reverse curves shall be appropriately illustrated.

Option:

11. A longitudinal buffer space may be used in the activity area to separate opposing vehicular traffic.

12. Where two or more lanes are being shifted, a W1-4 (or W1-3) sign with an ALL LANES (W24-1cP) plaque (see Figure 6F-4) may be used instead of a sign that illustrates the number of lanes.

13. Where more than three lanes are being shifted, the Reverse Curve (or Turn) sign may be rectangular.

Standard:

14. When a side road intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

15. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

16. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

17. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

18. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-32-Typical Application 32

Half Road Closure on a Multi-Lane, Undivided, High-Speed Roadway (> 40 MPH)

(Delaware Revision)

Standard:

1. Pavement markings no longer applicable shall be removed or obliterated as soon as practical. Except for intermediate-term and short-term situations, temporary markings shall be provided to clearly delineate the temporary travel path. For short-term and intermediate-term situations where it is not feasible to remove and restore pavement markings, channelization shall be made dominant by using a very close device spacing, such as 10 to 20 feet.

2. When a side road intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

3. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

Guidance:

4. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.

5. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

6. Shift areas should be illuminated at night, except in emergencies.

7. If the lane shift has curves with recommended speeds of 30 mph or less, Reverse Turn signs should be used.

8. If the tangent distance along the temporary diversion is less than 600 feet, a Double Reverse Curve sign should be used instead of the upstream Reverse Curve sign and the downstream Reverse Curve sign should be omitted.

9. Advisory Speed plaques should be used only when the advisory speed is less than the posted speed limit.

Standard:

10. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

11. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

12. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

13. A longitudinal buffer space may be used in the activity area.

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Notes for Figure 6H-33-Typical Application 33

Stationary Lane Closure on a Multi-Lane, Divided Highway

(Delaware Revision)

Standard:

1. This TTC zone application also shall be used when work is being performed in the lane adjacent to the median on a multi-lane, divided highway. In this case, the LEFT LANE CLOSED signs and the corresponding Lane Ends (or MERGE RIGHT) signs shall be substituted.

2. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

4. On multi-lane, undivided roads and multi-lane, divided highways with narrow medians, the advance warning signs on the left-hand side of the directional roadway should be eliminated.

Support:

5. Where conditions permit, restricting all vehicles, equipment, workers, and their activities to one side of the roadway might be advantageous.

Standard:

6. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

7. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

9. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Guidance:

10. When a grade crossing exists within or upstream of the transition area and it is anticipated that queues resulting from the lane closure might extend through the grade crossing, the TTC zone should be extended so that the transition area precedes the grade crossing (see Figure 6H-46).

11. Early coordination with the railroad company or light rail transit agency should occur before work starts (see Figure 6H-46).

Option:

Guidance:

13. When a grade crossing equipped with active warning devices exists within the activity area, provisions should be made for keeping flaggers informed as to the activation status of these warning devices (see Figure 6H-46).

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Notes for Figure 6H-34-Typical Application 34

Lane Closure on a Multi-Lane, Divided Highway with a Temporary Traffic Barrier

(Delaware Revision)

Standard:

2. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

4. On multi-lane, undivided roads and multi-lane, divided highways with narrow medians, the advance warning signs on the left-hand side of the directional roadway should be eliminated.

5. For long-term lane closures on facilities with permanent edge lines, a temporary edge line should be installed from the upstream end of the merging taper to the downstream end of the downstream taper, and conflicting pavement markings should be removed.

6. The use of a barrier should be based on engineering judgment.

Standard:

7. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

8. If used, the temporary traffic barrier and retroreflective enhanced conspicuity panels shall comply with the provisions of Section 6F.85.

9. The barrier shall not be placed along the merging taper. The lane shall first be closed using channelizing devices and pavement markings.

Option:

10. The barrier shown in this TTC zone application is an example of one method that may be used to close a lane for a long-term project. If the work activity permits, a movable barrier may be used and relocated to the shoulder during non-work periods or peak-period vehicular traffic conditions, as appropriate.

Standard:

11. If a movable barrier is used, the temporary white edge line shown in the TTC zone application shall not be used. During the period when the right-hand lane is opened, the sign legends and the channelization shall be changed to indicate that only the shoulder is closed, as illustrated in Figure 6H-5. The arrow board, if used, shall be placed at the downstream end of the shoulder taper and shall display the caution mode.

Guidance:

12. If a movable barrier is used, the shift should be performed in the following manner. When closing the lane, the lane should be initially closed with channelizing devices placed along a merging taper using the same information employed for a stationary lane closure. The lane closure should then be extended with the movable-barrier transfer vehicle moving with vehicular traffic. When opening the lane, the movable-barrier transfer vehicle should travel against vehicular traffic from the termination area to the transition area. The merging taper should then be removed using the same information employed for a stationary lane closure.

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Notes for Figure 6H-35-Typical Application 35

Short Duration and Mobile Operations on a Multi-Lane, Divided Highway

with a Single Lane Closure

(Delaware Revision)

Standard:

1. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

2. If used, vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

3. Shadow and work vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

4. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

5. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

6. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

7. Work should normally be accomplished during off-peak hours to the extent practical.

8. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

9. The minimum distance between the shadow vehicles may vary according to terrain and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

10. Shadow Vehicle 4 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

11. If used, Shadow Vehicle 4 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

12. Except as provided in Notes 14 and 15 or as denoted as optional in Figure 6H-35, the work and shadow vehicles shall be equipped with truck-mounted attenuators for operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

13. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

14. Truck-mounted attenuators may be omitted from specialized work vehicles, such as sweeper, vacuum, and pothole patching trucks, and other work vehicles that cannot support the installation of a truck-mounted attenuator.

15. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, truck-mounted attenuators may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

16. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-35A-Typical Application 35A

Short Duration and Mobile Operations on a Multi-Lane, Divided Highway

with a Double Lane Closure

(Delaware Revision)

Standard:

1. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

3. Shadow and work vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

4. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

5. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

6. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

7. Work should normally be accomplished during off-peak hours to the extent practical.

8. Shadow Vehicle 1A should be used for stationary short duration operations only.

Option:

10. The minimum distance between the shadow vehicles may vary according to terrain and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

11. Shadow Vehicle 6 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

12. If used, Shadow Vehicle 6 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

13. Except as provided in Notes 15 and 16 or as denoted as optional in Figure 6H-35A, the work and shadow vehicles shall be equipped with truck-mounted attenuators for operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

14. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

15. Truck-mounted attenuators may be omitted from specialized work vehicles, such as sweeper, vacuum, and pothole patching trucks, and other work vehicles that cannot support the installation of a truck-mounted attenuator.

16. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, truck-mounted attenuators may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used or if the shoulder width is less than the width of a truck-mounted attenuator.

17. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-35B-Typical Application 35B

Mobile Striping Operations on a Multi-Lane, Divided Highway with a Single Convoy

(Delaware Revision)

Standard:

1. Except as provided in Figure 6H-35C (separate cone recovery convoy), a minimum of five vehicles shall be used for the mobile striping operation convoy.

2. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

3. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

5. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

6. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

7. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

8. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

9. Work should normally be accomplished during off-peak hours to the extent practical.

10. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

11. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

12. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used. Law enforcement vehicles may be used for this purpose.

13. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

Standard:

14. Shadow Vehicles 1 and 3 shall be equipped with truck-mounted attenuators for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

15. Where the shoulder width cannot accommodate a shadow vehicle, Shadow Vehicle 4 shall be equipped with a truck-mounted attenuator and positioned in the adjacent travel lane.

Option:

16. Truck-mounted attenuators may be used for mobile operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-35C-Typical Application 35C

Mobile Striping Operations on a Multi-Lane, Divided Highway

with a Separate Cone Recovery Convoy

(Delaware Revision)

Standard:

1. A minimum of three vehicles shall be used for the initial mobile striping application convoy and a minimum of three vehicles shall be used for the cone recovery convoy.

2. The cone recovery convoy shall operate in accordance with Figure 6H-35.

3. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

4. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

5. Vehicle-mounted signs shall be mounted in a manner such that they are not obscured by equipment or supplies. Sign legends on vehicle-mounted signs shall be covered or turned from view when work is not in progress.

6. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

7. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

8. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

9. The cone recovery should occur within 1 hour of the initial application or within the corresponding drying time based on ambient temperatures.

10. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

11. Work should normally be accomplished during off-peak hours to the extent practical.

12. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

13. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

14. Additional shadow vehicles to warn and reduce the speed of oncoming or opposing vehicular traffic may be used. Law enforcement vehicles may be used for this purpose.

15. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

Standard:

16. Shadow Vehicle 2 shall be equipped with a truck-mounted attenuator for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

17. Truck-mounted attenuators may be used for mobile operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-35D-Typical Application 35D

Mobile Striping Operations on an Interstate, Freeway, or Expressway with a Single Lane Closure and a Single Convoy

(Delaware Revision)

Standard:

1. Except as provided in Figure 6H-35E (separate cone recovery convoy), a minimum of six vehicles shall be used for the mobile striping operation convoy.

2. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

3. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

5. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

6. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

7. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

8. A law enforcement vehicle shall supplement the convoy on interstates, freeways, and expressways.

Guidance:

9. Closing an interior lane only on a directional roadway with three or more lanes is strongly discouraged because of worker safety and driver expectancy concerns associated with permitting high-speed traffic on both sides of the work space. When an interior lane is closed, an adjacent lane should also be considered for closure.

10. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

11. Work should normally be accomplished during off-peak hours to the extent practical.

Option:

13. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

14. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

15. Shadow Vehicle 7 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

16. If used, Shadow Vehicle 7 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

17. Shadow Vehicles 1, 2, 3, and 4 shall be equipped with truck-mounted attenuators for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph. If used, Shadow Vehicle 5 shall also be equipped with a truck-mounted attenuator.

18. Where the shoulder width cannot accommodate a shadow vehicle, Shadow Vehicle 6 shall be equipped with a truck-mounted attenuator and positioned in the adjacent travel lane.

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Notes for Figure 6H-35E-Typical Application 35E

Mobile Striping Operations on an Interstate, Freeway, or Expressway with a Single Lane Closure and a Separate Cone Recovery Convoy

(Delaware Revision)

Standard:

1. A minimum of three vehicles shall be used for the initial mobile striping application convoy and a minimum of three vehicles shall be used for the cone recovery convoy.

2. The cone recovery convoy shall operate in accordance with Figure 6H-35.

3. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

4. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

6. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

7. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

8. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

9. A law enforcement vehicle shall supplement the convoys on interstates, freeways, and expressways.

Guidance:

10. The cone recovery should occur within 1 hour of the initial application or within the corresponding drying time based on ambient temperatures.

11. Closing an interior lane only on a directional roadway with three or more lanes is strongly discouraged because of worker safety and driver expectancy concerns associated with permitting high-speed traffic on both sides of the work space. When an interior lane is closed, an adjacent lane should also be considered for closure.

12. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

13. Work should normally be accomplished during off-peak hours to the extent practical.

14. Whenever adequate stopping sight distance exists to the rear, the shadow vehicles should maintain the minimum distance from the preceding vehicle and proceed at the same speed. The shadow vehicles should slow down in advance of vertical or horizontal curves that restrict sight distance.

Option:

15. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

16. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

17. Shadow Vehicle 3 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

18. If used, Shadow Vehicle 3 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

19. Shadow Vehicle 2 shall be equipped with a truck-mounted attenuator for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

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Notes for Figure 6H-35F-Typical Application 35F

Mobile Striping Operations on an Interstate, Freeway, or Expressway with a Double Lane Closure and a Single Convoy

(Delaware Revision)

Standard:

1. Except as provided in Figure 6H-35G (separate cone recovery convoy), a minimum of six vehicles shall be used for the mobile striping operation convoy.

2. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

3. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

5. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

6. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

7. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

8. A law enforcement vehicle shall supplement the convoy on interstates, freeways, and expressways.

Guidance:

10. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

11. Work should normally be accomplished during off-peak hours to the extent practical.

Option:

13. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

14. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

15. Shadow Vehicle 7 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

16. If used, Shadow Vehicle 7 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

18. Where the shoulder width cannot accommodate a shadow vehicle, Shadow Vehicle 6 shall be equipped with a truck-mounted attenuator and positioned in the adjacent travel lane.

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Notes for Figure 6H-35G-Typical Application 35G

Mobile Striping Operations on an Interstate, Freeway, or Expressway with a Double Lane Closure and a Separate Cone Recovery Convoy

(Delaware Revision)

Standard:

1. A minimum of four vehicles shall be used for the initial mobile striping application convoy and a minimum of four vehicles shall be used for the cone recovery convoy.

2. The cone recovery convoy shall operate in accordance with Figure 6H-35A.

3. Arrow boards on the shadow vehicles shall, at a minimum, be Type B, with a size of 60 x 30 inches.

4. Flags and/or flashing lights shall be mounted on the gun carriages whenever the carriages extend 1 foot or more beyond the width of the application vehicle.

6. Shadow and application vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

7. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

8. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

9. A law enforcement vehicle shall supplement the convoys on interstates, freeways, and expressways.

Guidance:

10. The cone recovery should occur within 1 hour of the initial application or within the corresponding drying time based on ambient temperatures.

12. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards.

13. Work should normally be accomplished during off-peak hours to the extent practical.

Option:

15. The minimum distance between the shadow vehicles may vary according to terrain, paint drying time, and other factors, such as the manufacturer's recommendations for the truck-mounted attenuator.

16. Arrow boards may be omitted from work vehicles that cannot support the installation of an arrow board.

17. Shadow Vehicle 4 may be used where adequate shoulder width is available to display a portable changeable message sign.

Guidance:

18. If used, Shadow Vehicle 4 should be located upstream of queued traffic to advise motorists of the potential for stopped vehicles.

Standard:

19. Shadow Vehicles 2 and 3 shall be equipped with truck-mounted attenuators for mobile operations on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

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Notes for Figure 6H-35H-Typical Application 35H

Rolling Road Blocks on a Limited Access Multi-Lane, Divided Highway

(Delaware Revision)

Standard:

1. Rolling Road Block operations shall be approved by DelDOT's Traffic Section prior to use and shall be performed as outlined in Section 6G.22. 2. Arrow boards on the "control" vehicles and "chaser" vehicle shall, at a minimum, be Type B, with a size of 60 x 30 inches and shall be operated in the four-corner caution mode.

3. "Control" and "chaser" vehicles shall display high-intensity rotating, flashing, oscillating, or strobe lights.

4. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

5. Vehicles used for these operations should be made highly visible with appropriate equipment, such as signs or arrow boards. Standard: 6. All "control" vehicles shall be equipped with truck-mounted attenuators for rolling road block operations.

Option:

7. A truck-mounted attenuator may be omitted from the "chaser" vehicle for rolling road block operations.

Standard:

8. Law enforcement vehicles used for the Rolling Road Block operation shall display full emergency lighting and shall be equipped with an external light bar on the roof of the vehicle.

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Notes for Figure 6H-36-Typical Application 36

Lane Shift on a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. The lane shift should be used when the work space extends into either the right-hand or left-hand lane of a divided highway and it is not practical, for capacity reasons, to reduce the number of available lanes.

2. If the shoulder cannot adequately accommodate trucks, trucks should be directed to use the travel lanes.

3. The use of a barrier should be based on engineering judgment.

Option:

4. The barrier shown in this typical application is an example of one method that may be used to close a shoulder for a long-term project requiring a lane shift.

Standard:

5. If used, the temporary traffic barrier and retroreflective enhanced conspicuity panels shall comply with the provisions of Section 6F.85.

6. The barrier shall not be placed along the shifting taper. The lane shall first be shifted using channelizing devices and pavement markings.

7. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

8. A warning sign should be used to show the changed alignment.

9. If the tangent distance along the temporary diversion is less than 600 feet, Double Reverse Curve signs should be used instead of the upstream Reverse Curve signs and the downstream Reverse Curve signs should be omitted.

10. Advisory Speed plaques should be used only when the advisory speed is less than the posted speed limit.

Standard:

11. The number of lanes illustrated on the Reverse Curve signs shall be the same as the number of through lanes available to road users, and the direction of the reverse curves shall be appropriately illustrated.

Option:

12. Where two or more lanes are being shifted, a W1-4 (or W1-3) sign with an ALL LANES (W24-1cP) plaque (see Figure 6F-4) may be used instead of a sign that illustrates the number of lanes.

13. Where more than three lanes are being shifted, the Reverse Curve (or Turn) sign may be rectangular.

Standard:

14. The minimum width of the shoulder lane shall be 10 feet.

15. For long-term stationary work, existing conflicting pavement markings shall be removed and temporary markings shall be installed before traffic patterns are changed.

Option:

16. For short-term stationary work, lanes may be delineated by channelizing devices or removable pavement markings instead of temporary markings.

Guidance:

17. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

18. Shift areas should be illuminated at night, except in emergencies.

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Notes for Figure 6H-37-Typical Application 37

Double Lane Closure on a Multi-Lane, Divided Highway

(Delaware Revision)

Standard:

1. This TTC zone application also shall be used when work is being performed in the lanes adjacent to the median on a multi-lane, divided highway. In this case, the 2 LEFT LANES CLOSED signs and the corresponding Lane Ends (or MERGE RIGHT) signs shall be substituted.

2. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

3. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

Guidance:

4. The second arrow board should be placed in the closed exterior lane at the upstream end of the second merging taper.

Standard:

6. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

8. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-38-Typical Application 38

Interior Lane Closure on a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. Use of this TTC zone application is strongly discouraged because of worker safety and driver expectancy concerns associated with permitting high-speed traffic on both sides of the work space. When an interior lane is closed, an adjacent lane should also be considered for closure to provide additional space for vehicles and materials and to facilitate the movement of equipment within the work space. The method for closing an interior lane when the open lanes have the capacity to carry vehicular traffic should be as shown in Figure 6H-37, instead of as shown in this TTC zone application.

Standard:

2. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

3. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

4. For long-term stationary work, existing conflicting pavement markings shall be removed and temporary markings shall be installed before traffic patterns are changed.

Guidance:

5. The first arrow board displaying an arrow pointing to the right should be on the left-hand shoulder at the beginning of the taper. The arrow board displaying a double arrow should be centered in the closed interior lane and placed at the downstream end of the shifting taper.

6. If the two arrow boards create confusion, the 2L distance between the end of the merging taper and beginning of the shift taper should be extended so that road users can focus on one arrow board at a time.

7. The placement of signs should not obstruct or obscure arrow boards.

8. For long-term use, the dashed lane lines should be made solid white in the two-lane section.

9. A short, single row of channelizing devices should be added in advance of the vehicular traffic split to restrict vehicular traffic to their respective lanes.

10. When paved shoulders having a width of 8 feet or more are closed, channelizing devices should be used to close the shoulder in advance of the merging taper to direct vehicular traffic to remain within the traveled way.

Option:

11. As an alternative to initially closing the left-hand lane, as shown in the TTC zone application, the right-hand lane may be closed in advance of the interior lane closure with appropriate channelization and signs.

12. DO NOT PASS signs may be used.

13. If a paved shoulder having a minimum width of 10 feet and sufficient strength is available, the left-hand and center lanes may be closed and motor vehicle traffic carried around the work space on the right-hand lane and a right-hand shoulder.

Guidance:

14. When a shoulder lane is used that cannot adequately accommodate trucks, trucks should be directed to use the normal travel lanes.

15. For a long-term closure, a barrier should be used to provide additional safety to the operation in the closed interior lane. A buffer space should be used at the upstream end of the closed interior lane.

Standard:

16. If used, the temporary traffic barrier and retroreflective enhanced conspicuity panels shall comply with the provisions of Section 6F.85.

17. If used, the barrier shall not be placed along the shifting taper. The lane shall first be shifted using channelizing devices and pavement markings.

18. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

19. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

20. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

Guidance:

21. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

22. Shift areas should be illuminated at night, except in emergencies.

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Notes for Figure 6H-39-Typical Application 39

Median Crossover on a Multi-Lane, Divided Highway

(Delaware Revision)

Standard:

1. Channelizing devices or temporary traffic barriers shall be used to separate opposing vehicular traffic.

2. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

Guidance:

3. For long-term work on high-speed, high-volume highways, consideration should be given to using a temporary traffic barrier to separate opposing vehicular traffic.

Option:

4. When a temporary traffic barrier is used to separate opposing vehicular traffic, the Two-Way Traffic, DO NOT PASS, KEEP RIGHT, and DO NOT ENTER signs may be eliminated.

5. The alignment of the crossover may be designed as a reverse curve.

Guidance:

6. When the crossover follows a curved alignment, the design criteria contained in the AASHTO "Policy on the Geometric Design of Highways and Streets" (see Section 1A.11) should be used.

7. When channelizing devices have the potential of leading vehicular traffic out of the intended traffic space, the channelizing devices should be extended a distance in feet of 2.0 times the speed limit in mph beyond the downstream end of the transition area as depicted.

8. Where channelizing devices are used, the Two-Way Traffic signs should be repeated every 1 mile.

Option:

9. NEXT XX MILES Supplemental Distance plaques may be used with the Two-Way Traffic signs, where XX is the distance to the downstream end of the two-way section.

Support:

10. When the distance is sufficiently short that road users entering the section can see the downstream end of the section, they are less likely to forget that there is opposing vehicular traffic.

11. The sign legends for the four pairs of signs approaching the lane closure for the non-crossover direction of travel are not shown. They are similar to the series shown for the crossover direction, except that the left lane is closed.

Guidance:

12. A shifting taper length of L is preferred on state-maintained roads (see Tables 6C-3 and 6C-4).

13. Shift areas should be illuminated at night, except in emergencies.

14. Advisory Speed plaques should be used only when the advisory speed is less than the posted speed limit.

15. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

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Notes for Figure 6H-40-Typical Application 40

Median Crossover for an Entrance Ramp on a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. The TTC zone application illustrated should be used for carrying an entrance ramp across a closed directional roadway of a divided highway.

2. A temporary acceleration lane should be used to facilitate merging. The design criteria contained in the AASHTO "Policy on the Geometric Design of Highways and Streets" (see Section 1A.11) should be used for determining the acceleration lane length.

3. When used, the YIELD or STOP sign should be located so that ramp vehicular traffic has adequate sight distance of oncoming mainline vehicular traffic to select an acceptable gap in the mainline vehicular traffic flow, but should not be located so far forward that motorists will be encouraged to stop in the path of the mainline traffic. Also, a longer acceleration lane should be provided beyond the sign to reduce the gap size needed. If insufficient gaps are available, consideration should be given to closing the ramp.

4. Where STOP signs are used, a temporary stop line should be placed across the ramp at the desired stop location.

Option:

5. If vehicular traffic conditions allow, the ramp may be closed.

Standard:

6. Except as provided in Note 7, entrance ramp closures along state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

Option:

7. A detour plan may not be needed for entrance ramp closures during off-peak, short duration or mobile operations.

8. A broken edge line may be carried across the temporary entrance ramp to assist in defining the through vehicular traffic lane.

9. When a temporary traffic barrier is used to separate opposing vehicular traffic, the Two-Way Traffic signs and the DO NOT ENTER signs may be eliminated.

10. A Stop Beacon (see Section 4L.05) may be placed above the STOP sign.

11. Where the acceleration distance is significantly reduced, a supplemental plaque may be placed below the Yield Ahead sign reading NO MERGE AREA.

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Notes for Figure 6H-41-Typical Application 41

Median Crossover for an Exit Ramp on a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. This TTC zone application should be used for carrying an exit ramp across a closed directional roadway of a divided highway. The design criteria contained in the AASHTO "Policy on the Geometric Design of Highways and Streets" (see Section 1A.11) should be used for determining the curved alignment.

2. The guide signs should indicate that the ramp is open, and where the temporary ramp is located. Conversely, if the ramp is closed, guide signs should indicate that the ramp is closed.

3. When the exit is closed, a black on orange EXIT CLOSED sign panel should be placed diagonally across the interchange/intersection guide signs and channelizing devices should be placed to physically close the ramp.

4. In the situation (not shown) where channelizing devices are placed along the mainline roadway, the devices' spacing should be reduced in the vicinity of the off ramp to emphasize the opening at the ramp itself. Channelizing devices and/or temporary pavement markings should be placed on both sides of the temporary ramp where it crosses the median and the closed roadway.

5. Advance guide signs providing information related to the temporary exit should be relocated or duplicated adjacent to the temporary roadway.

Standard:

6. A temporary EXIT sign shall be located in the temporary gore. For better visibility, it shall be mounted a minimum of 7 feet from the pavement surface to the bottom of the sign.

Option:

7. Guide signs referring to the exit may need to be relocated to the median.

8. The temporary EXIT sign placed in the temporary gore may be either black on orange or white on green.

9. In some instances, a temporary deceleration lane may be useful in facilitating the exiting maneuver.

10. When a temporary traffic barrier is used to separate opposing vehicular traffic, the Two-Way Traffic signs may be omitted.

11. If vehicular traffic conditions allow, the ramp may be closed.

Standard:

12. Except as provided in Note 13, exit ramp closures along state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

Option:

13. A detour plan may not be ne

Guidance:

eded for exit ramp closures during off-peak, short duration or mobile operations.

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Notes for Figure 6H-42-Typical Application 42

Work in the Vicinity of an Exit Ramp on a Multi-Lane, Divided Highway

(Delaware Revision)

1. The guide signs should indicate that the ramp is open, and where the temporary ramp is located. However, if the ramp is closed, guide signs should indicate that the ramp is closed.

2. When the exit ramp is closed, a black on orange EXIT CLOSED sign panel should be placed diagonally across the interchange/intersection guide signs.

3. The design criteria contained in the AASHTO "Policy on the Geometric Design of Highways and Streets" (see Section 1A.11) should be used for determining the alignment.

Standard:

4. A temporary EXIT sign shall be located in the temporary gore. For better visibility, it shall be mounted a minimum of 7 feet from the pavement surface to the bottom of the sign.

Option:

5. The temporary EXIT sign placed in the temporary gore may be either black on orange or white on green.

Standard:

6. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

7. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

8. Truck off-tracking should be considered when determining whether the minimum lane width of 12 feet is adequate (see Section 6G.08).

Option:

9. If vehicular traffic conditions allow, the ramp may be closed.

Standard:

10. Except as provided in Note 11, exit ramp closures along state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

Option:

11. A detour plan may not be needed for exit ramp closures during off-peak, short duration or mobile operations.

Standard:

12. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

13. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

14. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-43-Typical Application 43

Partial Exit Ramp Closure

(Delaware Revision)

Guidance:

1. Truck off-tracking should be considered when determining whether the minimum lane width of 10 feet is adequate (see Section 6G.08).

Option:

2. If vehicular traffic conditions allow, the ramp may be closed.

Standard:

3. Except as provided in Note 4, full exit ramp closures along state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

Option:

4. A detour plan may not be needed for full exit ramp closures during off-peak, short duration or mobile operations.

Standard:

5. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

7. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-44-Typical Application 44

Work in the Vicinity of an Entrance Ramp on a Multi-Lane, Divided Highway

(Delaware Revision)

Guidance:

1. On the right diagram, a temporary acceleration lane should be used to facilitate merging. The design criteria contained in the AASHTO "Policy on the Geometric Design of Highways and Streets" (see Section 1A.11) should be used for determining the acceleration lane length.

Standard:

2. For the information shown on the diagram on the right-hand side of the TTC zone application, where inadequate acceleration distance exists for the temporary entrance, the YIELD sign shall be replaced with STOP signs (one on each side of the approach).

Guidance:

4. Where STOP signs are used, a temporary stop line should be placed across the ramp at the desired stop location.

5. The mainline merging taper with the arrow board at its starting point should be located sufficiently in advance so that the arrow board is not confusing to drivers on the entrance ramp, and so that the mainline merging vehicular traffic from the lane closure has the opportunity to stabilize before encountering the vehicular traffic merging from the ramp.

6. If the ramp curves sharply to the right, warning signs with advisory speeds located in advance of the entrance terminal should be placed in pairs (one on each side of the ramp).

Option:

7. A Stop Beacon (see Section 4L.05) may be placed above the STOP sign.

8. Where the acceleration distance is significantly reduced, a supplemental plaque may be placed below the Yield Ahead sign reading NO MERGE AREA.

Standard:

9. An arrow board shall be used when a lane is closed. When more than one lane is closed, a separate arrow board shall be used for each closed lane.

10. When a side road or entrance ramp intersects the highway within the TTC zone, additional TTC devices shall be placed as needed.

Guidance:

11. Truck off-tracking should be considered when determining whether the minimum lane width of 12 feet is adequate (see Section 6G.08).

Option:

12. If vehicular traffic conditions allow, the ramp may be closed.

Standard:

13. Except as provided in Note 14, entrance ramp closures along state-maintained roadways shall have a detour plan approved by DelDOT Traffic.

Option:

14. A detour plan may not be needed for entrance ramp closures during off-peak, short duration or mobile operations.

Standard:

15. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

Option:

16. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

17. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Notes for Figure 6H-45-Typical Application 45

Temporary Reversible Lane Using Movable Barriers

(Not Applicable in Delaware)

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Notes for Figure 6H-46-Typical Application 46

Work in the Vicinity of a Grade Crossing

(Delaware Revision)

Guidance:

1. When grade crossings exist either within or in the vicinity of roadway work activities, extra care should be taken to minimize the probability of conditions being created, by lane restrictions, flagging, or other operations, where vehicles might be stopped within the grade crossing, considered as being 50 feet on either side of the closest and farthest rail.

2. When a grade crossing exists within or upstream of the transition area and it is anticipated that queues resulting from the lane closure might extend through the grade crossing, the TTC zone should be extended so that the transition area precedes the grade crossing.

3. When a grade crossing exists within the activity area, drivers operating on the left-hand side of the normal center line should be provided with comparable warning devices as for drivers operating on the right-hand side of the normal center line.

Standard:

4. If the queuing of vehicles across active rail tracks cannot be avoided, a uniformed law enforcement officer or flagger shall be provided at the upstream side of the grade crossing to prevent vehicles from stopping within the grade crossing (as described in Note 1), even if automatic warning devices are in place.

Guidance:

5. When a grade crossing equipped with active warning devices exists within the activity area, provisions should be made for keeping flaggers informed as to the activation status of these warning devices.

6. Early coordination with the railroad company or light rail transit agency should occur before work starts.

7. In the example depicted, the buffer space of the activity area should be extended upstream of the grade crossing (as shown) so that a queue created by the flagging operation will not extend across the grade crossing.

8. The DO NOT STOP ON TRACKS sign should be used on all approaches to a grade crossing within the limits of a TTC zone.

9. Where drivers emerging from an intersecting roadway will not encounter an advance warning sign prior to the work zone, additional signs should be placed on the intersecting road.

Option:

10. A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:

11. When used, the BE PREPARED TO STOP sign should be located before the Flagger symbol (or FLAGGER AHEAD) sign.

Standard:

12. At night, flagger stations shall be illuminated, except in emergencies.

13. For long-term, intermediate-term, and short-term operations, a truck-mounted attenuator shall be used on roadways with a posted speed limit or 85th-percentile speed greater than 40 mph.

14. If the operation requires using a truck-mounted attenuator upstream of the grade crossing, the truck-mounted attenuator's roll-ahead buffer space shall not extend across the grade crossing.

Option:

15. For short duration operations of 15 minutes or less along roadways with a posted speed limit or 85th-percentile speed greater than 40 mph, a truck-mounted attenuator may be omitted if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.

16. Truck-mounted attenuators may be used for all operations along roadways with a posted speed limit or 85th-percentile speed less than or equal to 40 mph.

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Delaware Administrative CodeTitle 2 - Transportation2000 - Department of Transportation2400 - Division of Transportation Solutions2402 - Manual on Uniform Traffic Control Devices (MUTCD)Part 6 - Temporary Traffic ControlChapter 6H - TYPICAL APPLICATIONSSection 6H.01 - Typical Applications

Delaware Administrative Code
Title 2 - Transportation
2000 - Department of Transportation
2400 - Division of Transportation Solutions
2402 - Manual on Uniform Traffic Control Devices (MUTCD)
Part 6 - Temporary Traffic Control
Chapter 6H - TYPICAL APPLICATIONS
Section 6H.01 - Typical Applications