National Maximum Speed Law for the 55 mph speed limit offered, "Speed limit 55. It's not just a good idea. It's the law.". Intelligentsia riffed that with a more absolute statement based on the speed of light: "186,000 miles per second. It's not just a good idea, it's the law." National Maximum Speed Law The National Maximum Speed Law (NMSL) in the United States was a provision of the Federal 1974 Emergency Highway Energy Conservation Act that prohibited speed limits higher than . It was drafted in response to oil price spikes and supply disruptions during the 1973 oil crisis. While Federal officials hoped
Speed limits in the United States the same is true for up to 600 miles of freeways in Michigan. Portions of the Idaho, Montana, Nevada, South Dakota, Texas, Utah, and Wyoming road networks have posted limits. The highest posted speed limit in the country is and can be found only on the Texas State Highway 130. For 13 years (January 1974–April 1987), federal law withheld Federal highway trust funds to states that had speed limits above . From April 1987 to December 8, 1995, an amended federal law disincentivized speed limits above . This table contains the most usual posted daytime speed limits, in miles per