Work Zone Compliance Guide for Flaggers
A flagger controls traffic directly, standing close to it, which makes readiness and position central to the role. This guide outlines what a flagger needs in place before controlling traffic.
Last reviewed: June 24, 2026
What This Role Owns
- Being trained for the task per the applicable requirement.
- Wearing high-visibility apparel appropriate for the conditions.
- Standing in a visible position with a planned escape path.
- Coordinating with other flaggers so traffic is controlled safely.
Before Controlling Traffic
A flagger's safety starts before the first vehicle. Confirm training, apparel, the signaling device, and that flagger-ahead advance warning is in place upstream.
- Confirm you are trained for the task.
- Wear high-visibility apparel and use the correct signaling device.
- Confirm flagger-ahead advance warning signs are placed upstream.
Position and Coordination
Where a flagger stands, and how flaggers coordinate, keeps both workers and drivers safe. Keep visibility to approaching traffic and a clear escape path, and never release one lane from both ends.
- Stand where approaching traffic can see you, with an escape path.
- Coordinate with other flaggers so a lane is released from only one end.
- Confirm lighting is adequate if flagging at night.
Common Pitfalls for This Role
- Flagging without the required training.
- Standing where approaching drivers cannot see the flagger in time.
- Having no planned escape path from traffic.
- Two flaggers releasing the same lane from both ends.
Checklists for This Role
Related Pages
Frequently Asked Questions
What does a flagger need before controlling traffic?
Generally: training for the task, high-visibility apparel, the correct signaling device, flagger-ahead advance warning upstream, a visible position, and a planned escape path. Specific requirements come from the applicable standard and the approved plan.
Why must flaggers coordinate on a one-lane setup?
On alternating one-lane traffic, if two flaggers release the same lane from both ends, vehicles can meet head-on. Coordinating so the lane is released from only one end at a time is a core part of safe flagging.
Need Project-Specific Support?
Work Zone Compliance provides general educational information. For project-specific traffic control plan support, permit coordination, or public right-of-way planning in Southern California, visit Public Ready.
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