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A C-31 Construction Zone Traffic Control license authorizes setting up and removing lane closures, flagging operations, and traffic diversions using portable devices on public streets and roadways, under 16 CCR §832.31. Read the complete C-31 exam guide for requirements and exam structure.
The CSLB C-31 trade exam weights its content into Planning and Estimating, Notifications and Coordination, Transportation and Training, and Safety, reflecting a job that’s overwhelmingly about correctly staging temporary devices, not building anything permanent. C-31 draws on the California Manual on Uniform Traffic Control Devices (Caltrans Part 6) and overlaps C-45 Sign work and Class A General Engineering on large public-works roadway projects.