Iowa CDL Road Signs

Iowa follows the federal Manual on Uniform Traffic Control Devices (MUTCD). The Iowa 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: Iowa CDL Manual PDF Iowa DOT Commercial Drivers page mutcd.fhwa.dot.gov