Federal-Aid Highway Amendments of 1974
Encyclopedia
The Federal-Aid Highway Amendments of 1974 was signed into law by President of the United States
President of the United States
The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

 Gerald Ford
Gerald Ford
Gerald Rudolph "Jerry" Ford, Jr. was the 38th President of the United States, serving from 1974 to 1977, and the 40th Vice President of the United States serving from 1973 to 1974...

 on January 4, 1975. 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
Interstate Highway System
The Dwight D. Eisenhower National System of Interstate and Defense Highways, , is a network of limited-access roads including freeways, highways, and expressways forming part of the National Highway System of the United States of America...

. It also established the Federal Bridge Gross Weight Formula
Federal Bridge Gross Weight Formula
The Federal Bridge Gross Weight Formula is a mathematical formula in use in the United States by truck drivers and Department of Transportation officials to determine the appropriate maximum gross weight for a commercial motor vehicle based on axle number and spacing...

as law, which governed the weight-to-length ratio of trucks in order to protect highway bridges and infrastructure.
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