Do you currently have car insurance? Insurance is mandatory to drive in California Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. 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. Take a FREE Practice Test Now This questions appears in the following tests: Arizona Knowledge Test Class A , Missouri Knowledge Test Class A , Tennessee Knowledge Test Class B , Wyoming Knowledge Test Class B ,