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What Are the Federal Axle Weight Limits for Commercial Trucks?

A truck carrying a heavy haul load.

Legal axle weight limits for commercial trucks in the U.S. are commonly 20,000 pounds on a single axle and 34,000 pounds on a tandem axle, with an 80,000-pound gross vehicle weight limit on interstate highways. However, actual legal weight depends on axle spacing, axle group configuration, state laws, and the route being used.

Important note: Every state has different regulations for the maximum gross vehicle weight (total weight of the loaded truck and trailer) allowed on their roads. These weight regulations are based on the state’s infrastructure and what the roads can safely support. 

Can a truck be overweight on one axle even if it is under 80,000 pounds gross?
Yes. A truck can be legal in total gross weight and still be overweight if too much weight is concentrated on a single axle or tandem axle group.

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