What is the highway act or 1956?

The Highway Act of 1956, also known as the National Interstate and Defense Highways Act, authorized the construction of a 41,000-mile network of interstate highways in the United States. It was aimed at improving the nation's infrastructure for defense and economic purposes, as well as promoting interstate commerce and travel. The act provided for federal funding for 90% of the cost of the interstate construction, with the states responsible for the remaining 10%.