Question A bridge formula: Answers Permits less weight per axle for axles that are close together. Permits more weight for trucks. Is not a concern for drivers. Explanation Maximum axle weights are often set by a bridge formula, which sets a lower maximum weight for axles that are close together. This questions appears in the following tests: Alaska Class A Knowledge Test Arkansas Class B Knowledge Test Louisiana Class A Knowledge Test Louisiana Class B Knowledge Test Mississippi Tank Missouri Class A Knowledge Test Oklahoma Class A Knowledge Test Tennessee Passenger Wyoming Class A Knowledge Test