Interstates are a network of highways in the United States designed for long-distance travel and efficient transportation of goods. Officially known as the Dwight D. Eisenhower National System of Interstate and Defense Highways, they were established in 1956. Interstates are characterized by multiple lanes, limited access points, and high speed limits, making them essential for connecting cities and states. These highways are crucial for the economy, as they facilitate trade and travel across the country. The Federal Highway Administration oversees their maintenance and development, ensuring safety and efficiency for millions of drivers each year.