What Is It? Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge. This is accomplished either by spreading weight over additional axles or by increasing the distance between axles.
How do you calculate bridge law?
W = 500(LN/N-1 + 12N + 36) W = Overall gross weight on any group of 2 or more consecutive axles to the nearest 500 pounds. L = Distance in feet between the extreme of any group of 2 or more consecutive axles. N = Number of axles in the group under consideration.
What do bridge weight limit signs mean?
Through bridge weight limit signs, the traveling public receives notice of the maximum vehicle weight a specific bridge can safely support. The signs also help extend bridge service life by preventing damage and potential failures.
What is the California bridge law?
The state of California requires all tractor-trailer combinations to meet the King Pin to Rear Axle (KPRA) law. The center of the rear axle on all trailers must be at the 40-foot mark or shorter and must not weigh over 34,000 pounds on the trailer axles. ...Nov 14, 2016
How is bridge Law calculated?
Federal Bridge Formula Calculator | Bridge Law Formula W = the maximum weight in pounds that can be carried on a group of two or more axles to the nearest 500 pounds (230 kg). L = spacing in feet between the outer axles of any two or more consecutive axles.
What is the bridge law in trucking?
The bridge formula law was enacted by the U.S. Congress to limit the weight-to-length ratio of heavy trucks, and to protect roads and bridges from the damage caused by the concentrated weight of shorter trucks.
What is the purpose of the federal bridge formula?
What Is It? Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge. This is accomplished either by spreading weight over additional axles or by increasing the distance between axles.
How is bridge law measured?
Federal Bridge Formula Calculator | Bridge Law Formula W = the maximum weight in pounds that can be carried on a group of two or more axles to the nearest 500 pounds (230 kg). L = spacing in feet between the outer axles of any two or more consecutive axles.
How much weight can you have on each axle?
In addition to Bridge Formula weight limits, Federal law states that single axles are limited to 20,000 pounds, and axles spaced more than 40 inches and not more than 96 inches apart (tandem axles) are limited to 34,000 pounds. Gross vehicle weight is limited to 80,000 pounds (23 U.S.C.