Delaware Administrative Code
Title 2 - Transportation
2000 - Department of Transportation
2400 - Division of Transportation Solutions
2402 - Manual on Uniform Traffic Control Devices (MUTCD)
Part 3 - Marking
Chapter 3J - RUMBLE STRIP MARKINGS
Section 3J.02 - Transverse Rumble Strip Markings
Current through Register Vol. 28, No. 3, September 1, 2024
Support:
01 Transverse rumble strips consist of intermittent narrow, transverse areas of rough-textured or slightly raised or depressed road surface that extend across the travel lanes to alert drivers to unusual vehicular traffic conditions. Through noise and vibration, they attract the attention of road users to features such as unexpected changes in alignment and conditions requiring a reduction in speed or a stop.
02 This Manual contains no provisions regarding the design and placement of transverse rumble strips that approximate the color of the pavement. The provisions in this Manual address the use of markings in combination with a transverse rumble strip.
Standard:
03 Except as otherwise provided in Section 6F.87 for TTC zones, if the color of a transverse rumble strip used within a travel lane is not the color of the pavement, the color of the transverse rumble strip shall be either black or white.
Guidance:
04 White transverse rumble strips used in a travel lane should not be placed in locations where they could be confused with other transverse markings such as stop lines or crosswalks.
Table 3J-1. Transverse Rumble Strip Placement
(Delaware Revision)
| Posted Speed (MPH) | Sets of Strips* | Strip Spacing (inches) | Longitudinal Spacing of Each Set** (feet) |
| 25 | 4 - 5 | 24 | 75 |
| 30 | 4 - 5 | 24 | 100 |
| 35 | 4 - 5 | 24 | 100 |
| 40 | 4 - 5 | 30 | 125 |
| 45 | 4 - 5 | 30 | 125 |
| 50 | 4 - 5 | 36 | 150 |
| 55 | 4 - 5 | 36 | 150 |
* Each set consists of five individual strips.
** Spacing between sets of rumble strips and space required before the point at which a speed reduction must be obtained.
