Signs & Markings
Chevron & Advisory Speed Reference
Quick reference for Chevron Alignment Sign (W1-8) placement and Advisory Speed Plaque requirements on horizontal curves.
The use of the Chevron Alignment (W1-8) sign to provide additional emphasis and guidance for a change in horizontal alignment shall be in accordance with the information.
Placement Distance of Chevron Alignment Sign
Ref: MUTCD (2023) Section 2C
Table 2C-5. Typical Spacing of Chevron Alignment Signs on Horizontal Curves
| Advisory Speed | Curve Radius | Sign Spacing |
|---|---|---|
| 15 mph or less | Less than 200 feet | 40 feet |
| 20 to 30 mph | 200 to 400 feet | 80 feet |
| 35 to 45 mph | 401 to 700 feet | 120 feet |
| 50 to 60 mph | 701 to 1,250 feet | 160 feet |
| More than 60 mph | More than 1,250 feet | 200 feet |
Note: The relationship between the curve radius and the advisory speed shown in this table should not be used to determine the advisory speed.
Use of Advisory Speed Plaque
Table 2C-6. Use of Advisory Speed Plaque for Horizontal Alignment Changes
| Speed Differential | Use of Advisory Speed Plaque (W13-1P) |
|---|---|
| 5 mph | Optional |
| 10 mph | Recommended |
| 15 mph or more | Required |
Note: Speed differential is the difference between the advisory speed for the horizontal curve and the posted speed limit, statutory speed limit, or the 85th percentile speed on the approach to the curve.