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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). Truck drivers are responsible for checking their own vehicle's weight, usually by paying to be weighed ...
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.
These tests led to a 1964 recommendation by the AASHTO (to Congress) that the gross weight limit for trucks should be determined by a bridge formula table based on axle lengths, instead of a static upper limit. [2] By 1970 there were over 18 million trucks on America's roads. [1]
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 ...
When asked what type of vehicles the weight limit affects, WSDOT spokesperson Cara Mitchell wrote in an email to The News Tribune Aug. 12 that it depends on the total weight of the vehicle plus ...
Jan. 16—The aging Latah Bridge has new weight restrictions and is barred to some large vehicles, including garbage trucks, aerial fire trucks and other specialized trucks exceeding 22 tons after ...
The federal maximum weight is set at 80,000 pounds. Trucks exceeding the federal weight limit can still operate on the country's highways with an overweight permit, but such permits are only issued before the scheduled trip and expire at the end of the trip.