Interstates are a network of highways in the United States designed for long-distance travel and efficient transportation. Officially known as the Dwight D. Eisenhower National System of Interstate and Defense Highways, they connect major cities and regions, facilitating commerce and travel across the country. Established in 1956, the interstate system spans over 47,000 miles and is crucial for both civilian and military purposes. These highways are built for high-speed travel, featuring multiple lanes, limited access points, and standardized signage to ensure safety and efficiency for drivers.