WORKERS Sign Requirements

1. When a WORKERS Sign Is Used

Uses a worker symbol to warn that workers are present on or near the roadway ahead, signaling drivers to reduce speed and increase caution.

• Active work areas with workers on foot near traffic
• Short-duration and mobile operations
• Supplements lead advance warning signing

2. How and Where It Applies

In the field, W21-1 Workers is typically positioned at the approach to the activity area. Common deployments include active work areas with workers on foot near traffic; short-duration and mobile operations; supplements lead advance warning signing. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.

3. Placement and Application Notes

Position W21-1 approach to the activity area.

• Place the sign where drivers have a clear, unobstructed view on approach.
• Mount at the standard height and setback from the edge of the traveled way.
• Do not mount with other signs on the same post unless space constraints require it.

4. Standard Sizes and Visibility Considerations

Typical minimum: 48" × 48" on conventional roads; 60" × 60" on expressways and freeways.

• Choose size based on roadway speed, sight distance, and mounting location.
• Maintain high retroreflectivity for maximum night and adverse-weather visibility.

5. California Notes

Used in California work zones where workers are on foot near live traffic, often supplementing ROAD WORK AHEAD where worker exposure is a concern.

6. Common Field or Planning Mistakes

• Sign not shown at the correct advance distance for the posted speed.
• Advance warning sign missing or out of sequence on the TCP.
• Wrong size specified for the roadway classification (conventional vs. expressway).
• Sign sheeting / retroreflectivity class not noted on the plan.