Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Interstate 40 (I-40) is a major west east Interstate Highway in the United States. Its western terminus is at Interstate 15 in Barstow, California; its eastern terminus is at a concurrency of U.S. Route 117 and North Carolina Highway 132 in Wilmington, North Carolina. Much of the western portion of I-40, from Oklahoma City to Barstow, parallels or overlays the historic U.S. Route 66. I-40 intersects with eight of the 10 primary north south interstates (all except I-5 and I-45) and also with the major. Interstate routes I-24, I-30, I-44, I-77, and I-81.