What Is Temporary Traffic Control?
Temporary traffic control, often abbreviated TTC, is the system of signs, channelizing devices, markings, and methods used to guide vehicles, pedestrians, and bicycles safely through or around a work zone. It is temporary because it is installed for the work and removed when the work is done, unlike permanent signs and signals.
Last reviewed: June 24, 2026
Why It Matters
Temporary traffic control is how a work zone communicates with road users in a language they already understand, so traffic moves predictably past the work.
When it is incomplete, inconsistent, or in poor condition, road users are left to guess, which raises risk.
Where It Shows Up in the Field
TTC appears as the warning signs, cones and drums, arrow boards, barriers, and flaggers that make up a work-zone setup.
Individual sign codes and specifications are found on MUTCDSignChart.com; this site covers how the system is planned and managed.
Common Mistakes
- Using devices that do not match the speed or duration of the work.
- Gaps or inconsistencies that break the continuous guidance.
- Relying on a flagger to make up for a missing setup.
What to Check Before Work Begins
- That the TTC setup matches the approved traffic control plan.
- That devices are the right type, in the right place, and in good condition.
- That signs and devices remain visible and retroreflective at night.
Related Terms
Related Pages
Frequently Asked Questions
What does temporary traffic control include?
It includes the signs, channelizing devices, markings, arrow boards, barriers, and flagging used to guide road users through or around a work zone, installed for the work and removed afterward.
Where do I find individual sign meanings?
Individual sign codes, meanings, and specifications are on the sister site MUTCDSignChart.com. WorkZoneCompliance.com explains how the traffic control system is planned, installed, and managed.
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