- Post-mounted delineators are retroreflective marking devices mounted above a road surface to the side of a road. They are installed in series to indicate road alignment and help clarify the alignment in areas where it is confusing or violates expectations (e.g., lane reduction transitions, curves). Delineators also remain visible in wet or snowy conditions, unlike pavement markers, whose visibility is reduced in poor weather. They can also be used to delineate roads on approaches to railroad crossings.
- The minimum preview time for post-mounted delineators is 5 seconds.
- Drivers can perceive single and double delineators equally well. Thus, either can be used to delineate curves.
- If different colors are used on delineators, driver need to be educated on the meaning of each color.
- Table 20.3 lists recommended spacing for delineators on curves from the Manual on Uniform Traffic Control Devices.
| Table 20.3 Recommended Spacings for Post-Mounted Delineators | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Curve Radius (ft) | 50 | 115 | 180 | 250 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1,000 | |
| Approximate Spacing (S) on Curve | 20 | 25 | 35 | 40 | 50 | 55 | 65 | 70 | 75 | 80 | 85 | 90 | |
CONTACT:
Chris VanDyke
Research Scientist | Program Manager
chrisvandyke@uky.edu
