Utah Truck Mud Flap Law
Utah ties the gap to your wheel, not a fixed inch count. Flaps behind the rear wheels hang no lower than half the rear wheel's diameter, measured under any load (41-6a-1633), and must be at least as wide as the tires. The rule covers trucks 10,500 pounds or more, truck tractors, trailers 750 pounds or more unladen, and any lifted vehicle. Fenders or body panels that do the job satisfy it. Inspectors check width and that half-diameter gap.
What Utah makes you run
Utah ties the gap to your wheel, not a fixed inch count. Flaps behind the rear wheels hang no lower than half the rear wheel's diameter, measured under any load (41-6a-1633), and must be at least as wide as the tires. The rule covers trucks 10,500 pounds or more, truck tractors, trailers 750 pounds or more unladen, and any lifted vehicle. Fenders or body panels that do the job satisfy it. Inspectors check width and that half-diameter gap.
Coverage and clearance
- Required: Yes
- Coverage: At least as wide as the tires being protected, directly in line with them.
- Ground clearance: No more than 50% of the rear wheel's diameter off the ground (the wheel radius), measured under any conditions of loading (41-6a-1633).
- Fine: Infraction. A low, correctable equipment fine.
Utah Mud Flap FAQ
Are mud flaps required on trucks in Utah?
How low can mud flaps hang in Utah?
What is the mud-flap fine in Utah?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://le.utah.gov/xcode/Title41/Chapter6A/41-6a-S1633.html. See our Terms & Disclaimer.
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