Interstate Highway System

The Interstate Highway System is a system of freeways in the United States. It was first designed by Dwight D. Eisenhower in the 1950s. The Federal Aid Highway Act of 1956 was used to pay for construction.^[1] It was mostly built from the 1950s through the 1980s, but more freeways were built later. It is now about 47,000 miles long. Some interstates have tolls, but most do not.^[2] Most interstates have rest areas every few dozen miles.

1. ↑ "The Interstate Highway System". History. Retrieved 23 July 2014.
2. ↑ "All About Interstate Highways". AARoads Interstate Guide. 29 July 2008. Archived from the original on 30 June 2014. Retrieved 23 July 2014.