Current through Register Vol. 56, No. 18, September 16, 2024
(a)
The following apply to street grade:
1.
Minimum street grade permitted for all streets shall be 0.5 percent.
2. Maximum street grade shall vary by road
hierarchy with flatter grades required for roads with higher ADTs, in
accordance with the requirements shown in Table 4.6. Where terrain makes it
necessary, the allowable maximum grade may be increased by up to two percent,
but shall not exceed a maximum grade of 16 percent.
(b) The following shall apply to
intersections:
1. Street intersections shall
be as nearly at right angles as possible and in no case shall be less than 75
degrees.
2. New intersections along
one side of an existing street shall, if possible, coincide with any existing
intersections on the opposite side of each street. Where provided, offsets for
intersections along the same or opposite sides shall be at least 150 feet
between right-of-way centerlines.
3. Intersections shall be rounded at the
curbline with the street having the highest radius requirement, as shown in
Table 4.6 below, determining the minimum standard for all curblines.
4. Intersections shall be designed with a
flat grade wherever practical.
5.
The minimum centerline radius, minimum tangent length between reverse curves,
and curb radii shall be as shown in Table 4.6 below.
6. Sight triangles shall be in accordance
with AASHTO's "A Policy on Geometric Design of Highways and Streets" standards
and based on the speed limits established by the government agency having
jurisdiction. Sight triangle easements shall be required and shall include the
area on each street corner that is bounded by the line which connects the sight
or "connecting" points located on each of the right-of-way lines of the
intersecting street. The planting of trees or other plantings, or the location
of structures exceeding 30 inches in height that would obstruct the clear sight
across the area of the easements, shall be prohibited, and a public
right-of-entry shall be reserved for the purpose of removing any object,
material or otherwise, that obstructs the clear sight.
| TABLE 4.6 |
| STREET GRADE, CURVE AND INTERSECTION
DESIGN CRITERIA |
| Street Hierarchy |
| Special | Special | Rural, | Minor | Major |
| purpose | purpose | residential | collector | collector |
| street: | street: | access,
and |
| alley | cul-de-sac | neighborhood |
| Minimum
Grade | 0.5% | 0.5% | 0.5% | 0.5% | 0.5% |
| Maximum
Grade | 15% | 12% | 12% | 10% | 8% |
| Maximum Grade
of | 5% | 5% | 5% | 5% | 5% |
| Secondary Street within |
| 50 feet of |
| Intersection< + > |
| Minimum Center-Line | 100 ft | 100
ft | 100 ft | 150 | 300 |
| Radius | ft | ft |
| Minimum Tangent | 0 ft | 50 ft | 50
ft | 100 | 150 |
| Length between Reverse | ft | ft |
| Curves |
| Curb Radii | 20 ft | 25 ft | 25
ft | 30 ft | 35 ft |
Note: < + >As measured from the nearest right-of-way
line.
(c)
Pavement shall be designed using either Figures 4.2 through 4.5, the structural
number method, or the alternate pavement design methods referenced in (c)3
below.
1. Pavement design using figures:
Pavement design for special-purpose streets (cul-de-sac, rural, etc.),
residential access, neighborhood, minor collector, and major collector shall
follow the specifications shown in Figures 4.2 through 4.5 based on the street
type. Subgrade categories are shown in Table 4.7 below.
2. Structural number method: As an
alternative to using Figures 4.2 through 4.5, applicants may design pavement
using the structural numbers found in Table 4.9 below.
i. The designated structural number must be
achieved by choosing the appropriate layers of bituminous stabilized surface
course (Mix I-4, Mix I-5), bituminous stabilized base course (Mix I-2, stone
mix), bituminous stabilized base course (Mix I-2, gravel mix), dense graded
aggregate base course, soil aggregate base course, and subbase. The structural
values and minimum layer thicknesses for the various materials are listed in
Table 4.8 below. TABLE 4.7
SUBGRADE CATEGORIES
Data in
image
Notes: Refers to categories of soil types and
properties
Sources: Per the Rutgers Model Subdivision and Site Plan
Ordinance by David Listokin and Carole W. Baker, January 1987--Original
strength test and soil classification information derived from the Asphalt
Institute, "Thickness Design--Full-Depth Asphalt Pavement Structures for
Highways and Streets," MS-1, 8th Edition, August 1970 in Robert F. Baker et al.
(editor), Handbook of Highway Engineering. Inclusion of SW, SP, SC soil
classifications based on information from the Portland Cement Association's
Thickness Design for Concrete Highway and Street Pavements.
Revised CBR strength test and M[r] value information are from
the Asphalt Handbook for County and Municipal Engineers, November 1991 (Second
Edition), published by the New Jersey Society of Municipal Engineers.
| TABLE 4.8 |
| PER-INCH STRUCTURAL VALUE FOR VARIOUS
PAVING MATERIALS |
| Layer Material | Structural
value per-inch | Minimum |
| thickness | thickness |
| Asphalt concrete surface | 0.44 | 1.5
inches |
| course, Hot Mix Asphalt (HMA) |
| 9.5L64 or HMA 9.5M64< 1 > |
| Asphalt concrete base course | 0.44 | 3
inches |
| HMA 19L64 or HMA 19M64< 1 > |
| Dense graded aggregate base | 0.14 | 4
inches |
| course< 2 > |
| Soil aggregate base | 0.11 | 4 inches |
| course< 2 > |
| Subbase | 0.08 | 6 inches |
Notes:
< 1 > Materials for asphalt concrete surface and base
courses shall conform to Section 401 of the New Jersey Department of
Transportation's Standard Specifications for Road and Bridge
Construction.
< 2 > Materials for aggregate base shall conform to
Section 302 of the New Jersey Department of Transportation's Standard
Specifications for Road and Bridge Construction.
ii. Thicknesses shall be provided in 0.5 inch
increments.
| TABLE 4.9 |
|---|
| STRUCTURAL NUMBER VALUES AS A
FUNCTION OF ADT AND M[r]<1> |
|---|
| SN[0] prior to two-inch asphalt
concrete surface |
|---|
| course |
|---|
| Maximum
ADT<2> | M[r] = 3,000 | M[r] =
5,000 | M[r] = 7,500 |
|---|
| psi Poor
Subgrade | psiMedium | psiGood/Excellent |
|---|
| Subgrade | Subgrade |
|---|
| 200 | 1.60 | 1.15 | 0.84 |
| 250 | 1.69 | 1.23 | 0.91 |
| 500 | 1.99 | 1.49 | 1.14 |
| 750 | 2.17 | 1.65 | 1.29 |
| 1,000 | 2.31 | 1.77 | 1.40 |
| 1,250 | 2.42 | 1.87 | 1.48 |
| 1,500 | 2.52 | 1.95 | 1.55 |
| 1,750 | 2.60 | 2.02 | 1.61 |
| 2,000 | 2.67 | 2.08 | 1.67 |
| 2,250 | 2.73 | 2.13 | 1.72 |
| 2,500 | 2.79 | 2.18 | 1.76 |
| 2,750 | 2.84 | 2.23 | 1.80 |
| 3,000 | 2.89 | 2.27 | 1.84 |
| 3,250 | 2.93 | 2.31 | 1.88 |
| 3,500 | 2.97 | 2.35 | 1.91 |
| 3,750 | 3.17 | 2.52 | 2.06 |
| 4,000 | 3.21 | 2.55 | 2.09 |
| 4,250 | 3.24 | 2.58 | 2.12 |
| 4,500 | 3.28 | 2.61 | 2.15 |
| 4,750 | 3.31 | 2.64 | 2.17 |
| 5,000 | 3.34 | 2.67 | 2.20 |
| 5,250 | 3.37 | 2.69 | 2.22 |
| 5,500 | 3.40 | 2.72 | 2.24 |
| 5,750 | 3.42 | 2.74 | 2.26 |
| 6,000 | 3.45 | 2.76 | 2.28 |
| 6,250 | 3.48 | 2.79 | 2.30 |
| 6,500 | 3.50 | 2.81 | 2.32 |
| 6,750 | 3.52 | 2.83 | 2.34 |
| 7,000 | 3.55 | 2.85 | 2.36 |
| 7,250 | 3.57 | 2.87 | 2.38 |
| 7,500 | 3.59 | 2.89 | 2.39 |
Notes:
< 1 > All subgrades shall be considered "poor," unless
the applicant proves otherwise through CBR testing or field evaluation of soil
classification. Test results shall be reviewed by the municipal
engineer.
< 2 > ADT ranges for street types listed in the
standards are as follows:
| Rural Lane | 0-200 |
| Cul-de-sac | 0-250 |
| Rural Street | 0-500 |
| Alley | 0-500 |
| Multifamily Access | 0-1,000 |
| Cul-de-sac |
| Residential Access | 0-1,500 |
| Residential | 0-1,500 |
| Neighborhood |
| Minor Collector | 1,501-3,500 |
| Major Collector | 3,501-7,500 |
*2*Source: The Table is derived from the AASHTO Guide for
Design of *2*Pavement Structures (1993). *2*
3. Alternate pavement design: Alternate
pavement design shall be allowed provided it conforms with one of the
following: AASHTO Method of Flexible Pavement Design, AASHTO Method of Rigid
Pavement Design, Fatigue Strength Method of Design, Multilayer Elastic
Analysis, or the National Crushed Stone Association Design, incorporated herein
by reference.
(d)
Lighting (Reserved) Figure 4.2
Data in
image
Source: N.J.S.M.E., Asphalt Handbook for County and
Municipal Engineers, 4th Edition, April 2010. The figures were derived
by applying the Asphalt Institute's Thickness Design - Full Depth
Asphalt Pavement Structures for Highways and Streets.
NOTES:
1. Materials
for the hot mix asphalt (HMA) surface course shall be HMA 9.5L64 or HMA 9.5M64,
conforming to Section 401 of the New Jersey Department of Transportation's
Standard Specifications for Road and Bridge Construction.
2. Materials for the hot mix asphalt base
course shall be HMA 19L64 or HMA 19M64, conforming to Section 401 of the New
Jersey Department of Transportation's Standard Specifications for Road and
Bridge Construction.
3. Thicknesses
may have to be constructed in multiple lifts, based on equipment
capabilities.
4. The dense graded
aggregate base shall conform to Section 302 of the New Jersey Department of
Transportation's Standard Specifications for Road and Bridge
Construction.
5. All subgrades
shall be considered "poor" unless the applicant proves otherwise through CBR
testing or field evaluation of soil classification. Test results shall be
reviewed by the municipal engineer.
6. Subgrade compaction shall be approved by
the municipal engineer.
7. Pavement
thickness designs assume a staged construction process. The life of the road is
20 years. The pavement base course is designed to withstand construction
traffic during an assumed three-year construction period, throughout which time
the hot asphalt surface course has not been placed. At the end of the
construction period, the base course must have an expected remaining life of 17
years. During the time when the surface course is not in place, the base course
must carry the entire imposed traffic loading. Figure 4.3
Data in
image
Source: N.J.S.M.E., Asphalt Handbook for County and
Municipal Engineers, 4th Edition, April 2010. The figures were derived
by applying the Asphalt Institute's Thickness Design - Full Depth
Asphalt Pavement Structures for Highways and Streets.
NOTES:
1. Materials
for the hot mix asphalt (HMA) surface course shall be HMA 9.5L64 or HMA 9.5M64,
conforming to Section 401 of the New Jersey Department of Transportation's
Standard Specifications for Road and Bridge Construction.
2. Materials for the hot mix asphalt base
course shall be HMA 19L64 or HMA 19M64, conforming to Section 401 of the New
Jersey Department of Transportation's Standard Specifications for Road and
Bridge Construction.
3. Thicknesses
may have to be constructed in multiple lifts, based on equipment
capabilities.
4. The dense graded
aggregate base shall conform to Section 302 of the New Jersey Department of
Transportation's Standard Specifications for Road and Bridge
Construction.
5. All subgrades
shall be considered "poor" unless the applicant proves otherwise through CBR
testing or field evaluation of soil classification. Test results shall be
reviewed by the municipal engineer.
6. Subgrade compaction shall be approved by
the municipal engineer.
7. Pavement
thickness designs assume a staged construction process. The life of the road is
20 years. The pavement base course is designed to withstand construction
traffic during an assumed three-year construction period, throughout which time
the hot asphalt surface course has not been placed. At the end of the
construction period, the base course must have an expected remaining life of 17
years. During the time when the surface course is not in place, the base course
must carry the entire imposed traffic loading. Figure 4.4
Data in
image
Source: N.J.S.M.E., Asphalt Handbook for County and
Municipal Engineers, 4th Edition, April 2010. The figures were derived
by applying the Asphalt Institute's Thickness Design - Full Depth
Asphalt Pavement Structures for Highways and Streets.
NOTES:
1. Materials
for the hot mix asphalt (HMA) surface course shall be HMA 9.5L64 or HMA 9.5M64,
conforming to Section 401 of the New Jersey Department of Transportation's
Standard Specifications for Road and Bridge Construction.
2. Materials for the hot mix asphalt base
course shall be HMA 19L64 or HMA 19M64, conforming to Section 401 of the New
Jersey Department of Transportation's Standard Specifications for Road and
Bridge Construction.
3. Thicknesses
may have to be constructed in multiple lifts, based on equipment
capabilities.
4. The dense graded
aggregate base shall conform to Section 302 of the New Jersey Department of
Transportation's Standard Specifications for Road and Bridge
Construction.
5. All subgrades
shall be considered "poor" unless the applicant proves otherwise through CBR
testing or field evaluation of soil classification. Test results shall be
reviewed by the municipal engineer.
6. Subgrade compaction shall be approved by
the municipal engineer.
7. Pavement
thickness designs assume a staged construction process. The life of the road is
20 years. The pavement base course is designed to withstand construction
traffic during an assumed three-year construction period, throughout which time
the hot asphalt surface course has not been placed. At the end of the
construction period, the base course must have an expected remaining life of 17
years. During the time when the surface course is not in place, the base course
must carry the entire imposed traffic loading. Figure 4.5
Data in
image
Source: N.J.S.M.E., Asphalt Handbook for County and
Municipal Engineers, 4th Edition, April 2010. The figures were derived
by applying the Asphalt Institute's Thickness Design--Full Depth
Asphalt Pavement Structures for Highways and Streets.
NOTES:
1. Materials
for the hot mix asphalt (HMA) surface course shall be HMA 9.5L64 or HMA 9.5M64,
conforming to Section 401 of the New Jersey Department of Transportation's
Standard Specifications for Road and Bridge Construction.
2. Materials for the hot mix asphalt base
course shall be HMA 19L64 or HMA 19M64, conforming to Section 401 of the New
Jersey Department of Transportation's Standard Specifications for Road and
Bridge Construction.
3. Thicknesses
may have to be constructed in multiple lifts, based on equipment
capabilities.
4. The dense graded
aggregate base shall conform to Section 302 of the New Jersey Department of
Transportation's Standard Specifications for Road and Bridge
Construction.
5. All subgrades
shall be considered "poor" unless the applicant proves otherwise through CBR
testing or field evaluation of soil classification. Test results shall be
reviewed by the municipal engineer.
6. Subgrade compaction shall be approved by
the municipal engineer.
7. Pavement
thickness designs assume a staged construction process. The life of the road is
20 years. The pavement base course is designed to withstand construction
traffic during an assumed three-year construction period, throughout which time
the hot asphalt surface course has not been placed. At the end of the
construction period, the base course must have an expected remaining life of 17
years. During the time when the surface course is not in place, the base course
must carry the entire imposed traffic loading.
