A.R.S. § 28-958.01: Mud Flap Requirements
Rear fender splash guards
Does Arizona require mud flaps on trucks and trailers?
In Arizona, trucks, trailers, semitrailers, and buses must have rear fender splash guards (mud flaps) that extend no more than eight inches from the ground, cover the full tire tread, and stay parallel to the tire to keep mud or water off other vehicles' windshields. Pickup trucks rated at ten thousand pounds or less are exempt unless modified to raise their center of gravity, and truck tractors, converter dollies, and certain fendered trailers are also exempt.
Full statute text
Official text last checked against azleg.gov:
28-958.01. Rear fender splash guards
A. A person shall not operate a truck, trailer, semitrailer or bus on a highway unless the vehicle is equipped with rear fender splash guards that comply with the specifications provided in this section.
B. The splash guards:
1. Shall be attached in a manner that prevents the splashing of mud or water on the windshield of other motor vehicles.
2. Shall extend to a length of not more than eight inches from the ground.
3. Shall be wide enough to cover the full tread or treads of the tires being protected.
4. Shall be installed close enough to the tread surface of the tire or wheel to control the side throw of the bulk of the thrown road surface material.
5. May be constructed of a flexible rubberized material.
6. Shall be attached in a manner that, regardless of movement either in the splash guards or the vehicle, the splash guards retain their general parallel relationship to the tread surface of the tire or wheel under all ordinary operating conditions.
C. This section does not apply to:
1. A vehicle commonly known as a pickup truck with a manufacturer's gross vehicle weight rating of ten thousand pounds or less, except that this section applies if the pickup truck has been modified from the original bumper height design to raise the center of gravity of the pickup truck.
2. A truck tractor or converter dolly when used in combination with another vehicle.
3. A single, tandem or triple axle trailer with fenders that are wide enough to cover the full tread or treads of the tires being protected and that extend to a length of not more than fourteen inches from the ground.
AI-drafted summary, not attorney-reviewed. Statute text verified against azleg.gov. Legal information, not legal advice — consult a licensed attorney for your situation.