When did consruction begin on the 4-line interstate highway system?

Construction on the 4-line Interstate Highway System in the United States began on June 29, 1956, following the signing of the Federal-Aid Highway Act by President Dwight D. Eisenhower. This legislation initiated a massive project aimed at creating a nationwide network of highways to improve transportation and enhance national defense. The system was officially known as the Interstate Highway System, and construction continued throughout the following decades.