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| Long title | An Act to authorize appropriations for the construction of certain highways in accordance with title 23 of the United States Code, and for other purposes. |
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| Enacted by | the 93rd United States Congress |
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| Public law | Pub. L. 93–643 |
| Statutes at Large | 88 Stat. 2281 |
| Codification | |
| Acts amended | Emergency Highway Energy Conservation Act |
| Legislative history | |
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The Federal-Aid Highway Amendments of 1974 was signed into law by President of the United States Gerald Ford on January 4, 1975. [1] 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.