Title: Introduction to Flagging & MUTCD Standards
Type: Lesson
Flagging is the practice of controlling traffic through or around a work zone. Flaggers:
Keep motorists and workers safe
Provide clear and consistent signals
Maintain traffic flow during road work, utility work, or incidents
Without flaggers, work zones can become dangerous and chaotic for everyone on the road.
Flagging in the U.S. is governed by:
MUTCD – Manual on Uniform Traffic Control Devices (Part 6):
Defines national standards for flagging procedures, signs, and signals
Requires qualified flaggers in certain conditions
ATSSA – American Traffic Safety Services Association:
Provides nationally recognized flagger training and certifications
Partners with DOTs and contractors for safety compliance
Flaggers are typically required when:
Traffic is reduced to one lane
Heavy equipment or workers enter/exit the roadway
Drivers are approaching a hazard, detour, or narrow lane
Visibility is low or traffic is unpredictable
Flaggers may be the first and last line of defense between traffic and the work crew.
Protect the public, the crew, and yourself
Minimize driver confusion using clear instructions
Keep traffic moving safely and efficiently
React quickly to emergencies and changing conditions
Flaggers are the face of the work zone. Your signals, positioning, and awareness can prevent crashes, injuries, and deaths every day.
Click “Mark Complete” to continue to Lesson 2: Roles, Responsibilities & Work Zone Safety, where we’ll explain what flaggers are expected to do on site and how to stay safe.