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The Federal Bridge Gross Weight Formula, also known as Bridge Formula B or the Federal Bridge Formula, is a mathematical formula in use in the United States by truck drivers and Department of Transportation (DOT) officials to determine the appropriate maximum gross weight for a commercial motor vehicle (CMV) based on axle number and spacing ...
The federal gross weight limit for a Class 8 truck is 80,000 pounds (36,000 kg) (combined weight of truck, trailer, and cargo) with axle weights limited to 12,000 pounds (5,400 kg) (steering axle) and 34,000 pounds (15,000 kg) (tandem axles).
Each standard tracked vehicle is also defined in terms of track width, length, and spacing. Standard wheeled vehicles are designated by the same MLC numbers (4 through 150), which correspond to about 85% of the gross weight in short tons. Each standard wheeled vehicle is defined in terms of gross weight, number of axles, axle spacing, and axle ...
The Federal-Aid Highway Amendments of 1974 established a federal maximum gross vehicle weight of 80,000 pounds (36,000 kg), and introduced a sliding scale of truck weight-to-length ratios based on the bridge formula, but did not establish a federal minimum weight limit.
Among other changes, the law permanently implemented a national 55-mph speed limit (which had already been a temporary limit) for the Interstate Highway System. It also established the Federal Bridge Gross Weight Formula as law, which governed the weight-to-length ratio of trucks in order to protect highway bridges and infrastructure.
The driver of a dump truck learned the hard way that it's best not to tempt fate on a covered bridge originally built before the Civil War. The weight limit on the bridge was 3 tons (2,700 ...
Aug. 3—FLOYD COUNTY — Multiple traffic changes are occurring in Floyd County, including a five-day closure on U.S. 150 and new load restrictions on the Blackiston Mill Road bridge. The Floyd ...
The relationship between axle weight and spacing, known as the Federal Bridge Gross Weight Formula, is designed to protect bridges. [36] A standard 18-wheeler consists of three axle groups: a single front (steering) axle, the tandem (dual) drive axles, and the tandem trailer axles. Federal weight limits for NN traffic are: [37]