The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly called the Interstate Highway System, is a network of highways (also called expressways) in the United States. The Interstate Highway System is a separate system within the larger National Highway System. The entire system, as of 2004, had a total length of 46,837 miles (75,376 km).
This is a simplified orthogonal map of the Interstate System with the associated numbering scheme. The major highways, such as I-5, I-95, I-10 and I-90 are clearly identifiable in this map. I-5 runs from Canada to Mexico along the west coast (the only interstate to do so) while I-95 runs from Miami north to Canada along the east coast. In addition, I-10 runs from Santa Monica, California, to Jacksonville, Florida, while I-90 runs from Seattle to Boston.
Click here for an accurate geographical map of the Interstate Highway System.