Workers Ahead Sign - W21-1
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Choose Your Reflectivity Grade
Compare visibility, durability, and ideal applications
Engineering Grade
Ideal Use
Parking lots
Brightness
General Lifespan
7 years
Night-time Visibility
500 feet away
High Intensity Prismatic
Ideal Use
Roadways
Brightness
General Lifespan
10 years
Night-time Visibility
1000 feet away
Diamond Grade
Ideal Use
High-speed roadways
Brightness
General Lifespan
10+ years
Night-time Visibility
1500 feet away
Product Details
Workers Ahead Sign - W21-1
This heavy-duty warning sign is designed to enhance roadway safety by alerting drivers to the presence of workers in construction or maintenance zones. Constructed with high-quality aluminum featuring radius corners and 3/8 inch prepunched holes, the sign ensures durability and easy installation. Manufactured with high-intensity and diamond grade reflective sheeting, the Workers Ahead sign meets both state and federal Department of Transportation (DOT) and Manual on Uniform Traffic Control Devices (MUTCD) guidelines. Compliant with MUTCD Figure 6F-4, this W21-1 symbol sign provides critical visual communication to help protect workers and reduce potential roadside accidents.
Sign Specifications
MUTCD Code
W21-1
Sign Type
Construction Sign
Shape
Diamond
Standard warning sign shape
Colors
Orange background
Black legend
Compliance
MUTCD Compliant: This work zone warning sign meets federal standards per MUTCD Section 6F.16. Orange background indicates temporary traffic control.
| Size | Dimensions | Application |
|---|---|---|
| Minimum | 30x30" | Low-volume roads |
| StandardDefault | 36x36" | Conventional roads |
| Expressway | 48x48" | Expressways and freeways |
MUTCD Compliant
Federal standards
DOT Approved
State & Federal
ASTM D4956
Type III/IV/XI
10+ Years
Durability
Engineer Grade (EG)
Type: ASTM Type I
Lifespan: 5-7 years
Brightness: ~50 cd/lux/m²
Parking lots, low-speed areas, non-critical signage
High Intensity Prismatic (HIP)
Type: ASTM Type III/IV
Lifespan: 10 years
Brightness: ~360 cd/lux/m²
Traffic signs, work zones, roadways
Diamond Grade (DG3)
Type: ASTM Type XI
Lifespan: 10-12 years
Brightness: ~580 cd/lux/m²
Critical signs, freeways, overhead signs
Install in advance of work zone per MUTCD Chapter 6F. Orange background for temporary conditions. Remove or cover when work not in progress.
MUTCD Reference: Section 6F.16
Often Paired With
Signs commonly installed together per MUTCD guidelines
