In what year was the nationwide maximum speed limit set at 55 MPH?

The nationwide maximum speed limit was established at 55 miles per hour in 1974 as part of the Emergency Highway Energy Conservation Act. This legislation was introduced in response to the 1973 oil crisis, with the goal of reducing fuel consumption and conserving energy during a time of national fuel shortages. The 55 MPH limit was seen as a way to lower gasoline use and improve safety on highways. The speed limit remained in effect until it was ultimately repealed in 1995, after which states were allowed to set their own limits. This historical context highlights the significance of the 1974 decision in shaping speed limit regulations in the United States.