tractor trailer weight distribution calculator

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. In the event of a dispute, the statute and regulation take precedence with respect to maximum allowable Federal Bridge Formula weights. This guidance paraphrases provisions of 23 U.S.C. Previous editions of this guidance pamphlet are superseded and no longer valid. The Federal Highway Administration (FHWA) revises its guidance pamphlet Federal Bridge Formula Weights (May 2015). You may need the Adobe® Reader® to view the PDFs on this page.Ĭontact Information: Operations Feedback at Department of Transportation Home > Truck Size & Weight Bridge Formula Weights

Tractor trailer weight distribution calculator