![]() N = the number of axles in the group under consideration. L = the distance in feet between the outer axles of any group of two or more consecutive axles. W = the overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds. This is accomplished either by spreading weight over additional axles or by increasing the distance between axles.Ĭompliance with Bridge Formula weight limits is determined by using the following formula: What Is It?Ĭongress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge. This pamphlet describes the Bridge Formula, why it was established, and how it is used. With a few exceptions noted in this pamphlet, the Bridge Formula establishes the maximum weight any set of axles on a motor vehicle may carry on the Interstate highway system. Neither the Bridge Formula nor any resulting maximum gross weight values (table entries) has been changed. Previous editions of this pamphlet, entitled Bridge Gross Weight Formula (April 1984) and Bridge Formula Weights (January 1994), remain valid. In case of a dispute, the statute and regulations take precedence. ![]() 127 and 23 CFR 658 for the sake of clarity. This pamphlet paraphrases the provisions in 23 U.S.C.
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