W21-4
Slow Traffic Ahead
MUTCD W21-4 Slow Traffic Ahead fabricated on .080 in. 5052-H38 aluminum in HIP/DG reflective sheeting.
The W21-4 Slow Traffic Ahead is built to MUTCD spec on .080 in. 5052-H38 aluminum with 3M retroreflective sheeting. Available sizes: 30x30, 36x36, 48x48. Tell us your job and we confirm pricing and lead time.
High-Intensity Prismatic
Custom sizes, legends, and municipal logos available. Tell us what you need.
Specifications
| MUTCD Code | W21-4 |
|---|---|
| Shape | Diamond |
| Standard Colors | Black on orange |
| Legend | SLOW TRAFFIC AHEAD |
| Substrate | .080 in. 5052-H38 aluminum |
| Available Sizes | 36x18 in. |
| Reflective Grades | High-Intensity Prismatic |
| Lead Time | 14 days (made to order) |
Sizes & Variants
1 variant available. Add any to a quote request — we confirm pricing and lead time.
| Part Number | Size | Reflective Grade | |
|---|---|---|---|
| W21-4.3618HA | 36x18 in. | High-Intensity Prismatic | Add to Quote |
Need Slow Traffic Ahead fast?
We fabricate to MUTCD spec and ship nationwide. Toll-free 800-255-4369.