Oklahoma Truck Weight Limits

How much a truck can weigh in Oklahoma

You are held to 80,000 pounds on every Oklahoma road, Interstate or not, because gross weight is pinned to the federal bridge formula (47 O.S. 14-109). Single axle 20,000, tandem 34,000. The routine way past 80,000 is the $350 annual special overload permit: 5 percent over gross and 8 percent over the axles, off the Interstate only, for grain, livestock, timber, rock, sand and oilfield loads, which works out to about 84,000. Grandfathered doubles and triples run to 90,000 on the Interstate and other four-lane divided highways on an annual special authorization permit. Overweight is a misdemeanor, $5 to $500 (47 O.S. 17-101) and up to $1,000 for certain size and weight violations (47 O.S. 172), and the Turnpike Authority can add its own per-pound charge on top.

Axles, off-Interstate, and permits

• Off the Interstate: 80,000 lb, the same as the Interstate; gross weight on any road or highway is tied to the federal bridge formula (47 O.S. 14-109(A)). A $350 annual special overload permit allows 5% over gross off the Interstate, about 84,000 lb (47 O.S. 14-109(D))
• Single axle: 20,000 lb
• Tandem axle: 34,000 lb
• With a permit: About 84,000 lb off the Interstate on the $350 annual special overload permit, which allows 5% over gross and 8% over the axle limits for grain, livestock, timber, rock, sand, gravel, coal and oilfield loads (47 O.S. 14-109(D)). Grandfathered doubles and triples reach 90,000 lb on the Interstate and other four-lane divided highways on an annual special authorization permit (23 CFR 658 App. C). Everything else moves on an oversize/overweight permit (47 O.S. 14-116)
• Single axle 20,000 and tandem 34,000 hold statewide. Turnpike Authority can add its own per-pound charge on top of Highway Patrol fines. Fine-range figures come from statute-based aggregators; verify the current schedule with DPS.

Posted bridge and road limits

Oklahoma posts load-limited bridges and roads on MUTCD R12 signs. WEIGHT LIMIT X TONS is short tons (2,000 lb), so 10 TONS means 20,000 lb. A posted limit overrides the legal max: a legal 80,000-lb rig cannot cross a bridge posted below its weight and must detour. Crossing a posted structure over the limit is its own violation, separate from a highway-overweight ticket, and you can be held liable for damage to the bridge.

What running heavy costs

A weight violation is a misdemeanor: $5 to $500 (47 O.S. 17-101), and certain size and weight violations up to $1,000 (47 O.S. 172). Oklahoma's code does not set the graduated per-pound schedule some vendor guides quote.

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