Federal Bridge Gross Weight Formula Law and Legal Definition

The Federal Bridge Gross Weight Formula is a mathematical formula used in the United States to calculate the appropriate maximum gross weight for a commercial motor vehicle based on axle number and spacing. Truck drivers and Department of Transportation in the U.S. use the formula. It is part of federal weight and size regulations regarding interstate commercial traffic. This formula is needed to prevent heavy vehicles from damaging roads and bridges.

Commercial motor vehicles are most often tractor-trailers or buses, but the formula is of most interest to truck drivers due to the heavy loads their vehicles often carry.

Federal Bridge Gross Weight Formula is also known as Bridge Formula B or the Federal Bridge Formula.