Traffic Control
Temporary traffic control for work zones — the devices, signs, and methods used to guide road users safely through or around the work. Individual sign codes and specifications are covered on MUTCDSignChart.com.
Last reviewed: June 24, 2026
Why It Matters
Temporary traffic control is how a work zone communicates with the people using the road. Signs, channelizing devices, and barriers tell road users what to expect and where to go, in a language drivers already understand.
When devices are the right type, in the right place, and in good condition, traffic moves predictably past the work. When they are missing, damaged, or inconsistent, road users are left to guess.
Devices and What They Do
Traffic control devices include channelizing devices such as cones, drums, and delineators; barricades and sign supports; arrow boards and portable message signs; and positive protection such as barriers and crash cushions.
Each device has a job — warning, channelizing, or protecting — and they are used together as a system rather than in isolation.
Signs and the Sign Chart
Work-zone signs give advance warning, guidance, and regulation. This site explains how signs are managed in the field — sequencing, visibility, retroreflectivity, covering inactive signs, and removal.
For individual sign codes, meanings, and specifications, we link to MUTCDSignChart.com rather than duplicating that reference.
Placement, Spacing, and Condition
Devices only work when they are placed and spaced consistently and kept in good condition through the life of the setup.
Specific spacing distances, sign sizes, and device standards come from the applicable MUTCD, agency standard plans, and the approved plan, and must be verified against those sources.
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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