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Question:

Bridge formulas permit

A less maximum axle weight for axles that are close together.
Explaination

The axle weight is the maximum weight that an individual axle or set of axles can support. When a vehicle's axles are relatively close together, a high axle weight risks overloading bridges and roadways. To avoid overloading bridges, a bridge formula is often used to specify a lower maximum axle weight for axles that are closer together. The US Department of Transportation uses such a bridge formula to establish the maximum axle weights on interstate highways.