Interstate 40, or I-40 is an Interstate Highway in the United States. It runs from Barstow, California in the west to Wilmington, North Carolina in the east. The route is long. From west to east, it goes throughout the states of California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, and North Carolina. Some big cities it goes through are Albuquerque, New Mexico; Oklahoma City, Oklahoma; Little Rock, Arkansas; Memphis, Tennessee; Nashville, Tennessee; Winston-Salem, North Carolina; Greensboro, North Carolina; Durham, North Carolina; and Raleigh, North Carolina.