Federal-Aid Highway Amendments of 1974
The Federal-Aid Highway Amendments of 1974 was signed into law by President of the United States Gerald Ford 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. 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.
- "A Chronology of Dates Significant in the Background, History and Development of the Department of Transportation". U.S. Department of Transportation. October 3, 2008. Retrieved 2009-03-09.
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