Alaska Truck Mud Flap Law
Alaska keeps it simple. Every motor vehicle needs an antispray device that cuts wheel spray to the rear, mounted behind the wheel and hanging within 14 inches of level ground (13 AAC 04.265). That 14-inch allowance is looser than the 6 to 10 inches most Lower 48 states demand. The reg names no tread-width number, so run a flap at least as wide as the tire. Roadside it is a correctable equipment infraction, not an out-of-service item.
What Alaska makes you run
Alaska keeps it simple. Every motor vehicle needs an antispray device that cuts wheel spray to the rear, mounted behind the wheel and hanging within 14 inches of level ground (13 AAC 04.265). That 14-inch allowance is looser than the 6 to 10 inches most Lower 48 states demand. The reg names no tread-width number, so run a flap at least as wide as the tire. Roadside it is a correctable equipment infraction, not an out-of-service item.
Coverage and clearance
- Required: Yes
- Coverage: The reg states no tread-width figure; the device must sit directly behind the wheel and effectively cut rear spray. Run a flap at least as wide as the tire to be safe.
- Ground clearance: The antispray device must reach down to within 14 inches of the ground with the vehicle on level ground (13 AAC 04.265). That is a loose ceiling by national standards.
- Fine: Equipment infraction; low fine, generally correctable.
Alaska Mud Flap FAQ
Are mud flaps required on trucks in Alaska?
How low can mud flaps hang in Alaska?
What is the mud-flap fine in Alaska?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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.law.cornell.edu/regulations/alaska/13-AAC-04.265. See our Terms & Disclaimer.
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