Illinois CDL Road Signs
Illinois follows the federal Manual on Uniform Traffic Control Devices (MUTCD). The Illinois CDL knowledge test includes a road-sign section.
Quick reference
- Regulatory (white/red/black): Stop, Yield, Speed Limit.
- Warning (yellow diamond): curve, bump, merge.
- Construction (orange): work zone, flagger.
- Guide (green): distance, exits.
- Service (blue): hospital, food, fuel.
- School (pentagon, fluorescent yellow-green): school zone.
See the federal road signs guide for the full sign reference — 98+ signs with official FHWA sign art, including truck-specific signs like weigh stations, runaway ramps, and truck routes.
Sources: Illinois CDL Study Guide (DSD CDL 10) Illinois SOS CDL Overview mutcd.fhwa.dot.gov