The U.S. Interstate System is a network of highways that connects major cities across the United States. Established in 1956, it was designed to improve transportation efficiency and safety. The system includes over 47,000 miles of roads, allowing for faster travel and the movement of goods. Interstate highways are numbered, with odd numbers running north-south and even numbers running east-west. They are crucial for both local and long-distance travel, facilitating commerce and tourism. The Federal Highway Administration oversees the maintenance and development of this vital infrastructure.