FLAGGER (SYMBOL) Sign Requirements

1. When a FLAGGER (SYMBOL) Sign Is Used

Uses a flagger symbol to warn drivers that a flagger is controlling traffic ahead and that they must be prepared to stop or follow the flagger's directions.

• Flagging stations on lane closures and one-lane operations
• Paired with W3-4 BE PREPARED TO STOP
• Used with pilot-car operations on two-lane roads

2. How and Where It Applies

In the field, W20-7 Flagger (symbol) is typically positioned at the approach to the activity area. Common deployments include flagging stations on lane closures and one-lane operations; paired with W3-4 BE PREPARED TO STOP; used with pilot-car operations on two-lane roads. 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 W20-7 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

Placed ahead of a flagging station in a California TTC zone, commonly used with BE PREPARED TO STOP for alternating one-way or intermittent control.

6. Common Field or Planning Mistakes

• Flagger sign shown without BE PREPARED TO STOP (W3-4) where flagging warrants it.
• Flagger station location or sight distance inadequate for the posted speed.
• Sign omitted where flaggers control alternating one-lane traffic.
• Sheeting / retroreflectivity class not noted on the plan.