Flagging & Worker Safety
Controlling traffic with people, and protecting the crew inside the work zone — flagging operations, one-lane two-way control, automated flagger devices, internal traffic control, and struck-by prevention.
Last reviewed: June 24, 2026
Why It Matters
Flaggers and workers stand closest to live traffic, so how a work zone controls traffic and separates workers from it is directly tied to whether people go home safely.
Flagging manages the situations fixed devices cannot — like alternating traffic on a single open lane — while internal traffic control manages the hazards inside the work space itself.
Controlling Traffic With Flaggers
Flagging uses trained people to stop, slow, and release traffic, often where two directions share one lane. Flaggers rely on clear signals, good visibility, and a position where drivers can see them in time.
Flagging supports a traffic control plan; it does not replace proper advance warning and setup.
Protecting Workers Inside the Zone
Struck-by hazards come from both public traffic and the work zone's own vehicles and equipment. Internal traffic control plans, spotters, backing procedures, and worker paths keep people and machines apart.
High-visibility apparel, lighting, and clear escape routes help workers stay seen and stay safe.
Where Requirements Come From
Flagger qualifications, apparel, and worker-protection requirements come from the governing agency, OSHA and Cal/OSHA, and the approved plan.
These vary by jurisdiction and must be verified against the current standards and the requirements of the agency of jurisdiction.
Related Pages in This Category
Tools & Related Sections
Related Categories
Need project-specific support?
Work Zone Compliance is an educational resource. Public Ready supports traffic control planning, permit readiness, agency coordination, project-specific sign identification, and equipment sourcing through qualified providers across Southern California.
See Public Ready Services