Be Part of the Ultimate Safety & Compliance Community
Trending news, knowledge-building content, and more – all personalized to you!
Arizona has adopted Part 393 of the Federal Regulations.
Part 393 applies to a motor vehicle or combination of motor vehicles which has a gross vehicle weight rating (GVWR) of 26,001 pounds or more, and vehicles hauling hazardous materials in an amount required to be placarded.
All trucks, trailers and semitrailers must be equipped with rear splashguards before operating on the highways. The splashguards must be attached in a manner that prevents the splashing of mud or water on the windshields of other vehicles. They must be constructed of a flexible rubberized material, extend to a length of not more than eight inches from the ground, wide enough to cover the full tread or treads of the tires being protected, 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, and attached in a manner that, regardless of movement the splashguards retain their general parallel relationship to the tread surface of the tire or wheel under all ordinary operating conditions.
There are exceptions to this requirement for a pickup truck with a manufacturer’s gross vehicle weight rating of 10,000 pounds or less that has not been modified, a truck tractor or converter dolly when used in combination with another vehicle, and a single-axle, tandem-axle, or triple-axle trailer with fenders wide enough to cover the full tread or treads of the tires being protected that extend to a length of not more than 14 inches from the ground.
No tire may have blocks, studs, flanges, cleats, spikes, or other protuberances of any material other than rubber projecting beyond the tread surface.
Exception — Pneumatic tires with studs may be used between October 1 and May 1, if the metal in contact with the roadway never exceeds 3% of the total tire area.
Tire chains of reasonable size may be used for safety when snow, ice, or other conditions tending to cause skidding exist.