Arizona Truck Mud Flap Law
Arizona sets a hard number: rear splash guards on trucks, trailers, semis, and buses must reach within 8 inches of the ground (28-958.01). They cover the full tire tread, mount close enough to control side throw, and stay parallel to the tire. Pickups rated 10,000 pounds or less are exempt unless lifted above stock height. Fines run roughly $105 to $190 with surcharges, court-dependent. It is a civil equipment cite, not out-of-service. Troopers measure that 8-inch gap and full-tread width.
What Arizona makes you run
Arizona sets a hard number: rear splash guards on trucks, trailers, semis, and buses must reach within 8 inches of the ground (28-958.01). They cover the full tire tread, mount close enough to control side throw, and stay parallel to the tire. Pickups rated 10,000 pounds or less are exempt unless lifted above stock height. Fines run roughly $105 to $190 with surcharges, court-dependent. It is a civil equipment cite, not out-of-service. Troopers measure that 8-inch gap and full-tread width.
Coverage and clearance
- Required: Yes
- Coverage: Wide enough to cover the full tread or treads of the tires being protected.
- Ground clearance: Within 8 inches of the ground (28-958.01); the guard stays roughly parallel to the tire under normal operation.
- Fine: Civil traffic violation. Roughly $105 to $190 with surcharges depending on the court; a fix-it equipment cite.
Arizona Mud Flap FAQ
Are mud flaps required on trucks in Arizona?
How low can mud flaps hang in Arizona?
What is the mud-flap fine in Arizona?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.azleg.gov/ars/28/00958-01.htm. See our Terms & Disclaimer.
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