Oklahoma Truck Mud Flap Law
Oklahoma is an angle state. Any vehicle without fenders over its rearmost wheels must carry a rubber or fabric apron directly behind them, sized so it stops water and road debris thrown at more than a 22.5-degree tangent off the road (47 O.S. 12-405.3). Farm tractors under 20 mph are exempt. There is no inch-clearance number, so troopers judge whether the flap actually blocks the spray. A missing or too-short apron is a fix-it equipment citation, not an out-of-service defect.
A detail here is flagged medium confidence — confirm with the state statute before you rely on it.
What Oklahoma makes you run
Oklahoma is an angle state. Any vehicle without fenders over its rearmost wheels must carry a rubber or fabric apron directly behind them, sized so it stops water and road debris thrown at more than a 22.5-degree tangent off the road (47 O.S. 12-405.3). Farm tractors under 20 mph are exempt. There is no inch-clearance number, so troopers judge whether the flap actually blocks the spray. A missing or too-short apron is a fix-it equipment citation, not an out-of-service defect.
Coverage and clearance
- Required: Yes
- Coverage: Rubber or fabric apron hung perpendicular directly behind the rearmost wheels, sized to block the bulk of the spray; required on vehicles not already fitted with fenders over those wheels (47 O.S. 12-405.3).
- Ground clearance: No fixed inch figure. Performance standard: the apron must stop water and debris thrown from the rear wheels at tangents exceeding 22.5 degrees measured from the road surface (47 O.S. 12-405.3).
- Fine: Correctable equipment violation; low-dollar equipment fine set by the local court.
Oklahoma Mud Flap FAQ
Are mud flaps required on trucks in Oklahoma?
How low can mud flaps hang in Oklahoma?
What is the mud-flap fine in Oklahoma?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://law.justia.com/codes/oklahoma/title-47/section-47-12-405-3/. See our Terms & Disclaimer.
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