Interstate 40 is a primary interstate highway in the United States, serving as part of the Dwight D. Eisenhower National System of Interstate and Defense Highways. Running from west to east, this approximately 2,553-mile (4,108-kilometer) long route connects California with North Carolina, passing through several states, including Texas, New Mexico, Arizona, Utah, Colorado, Kansas, Oklahoma, Arkansas, Tennessee, and North Carolina. The highway is significant as a major eastwest transportation corridor and provides access to cities like Barstow, Albuquerque, Amarillo, Nashville, Knoxville, and Asheville. I-40 is known for its historical significance, scenic beauty, and cultural diversity along its route.