Interstate 40 in Arizona Interstate 40 in Arizona Interstate 40 (I-40) is an east–west Interstate Highway that has a section in the U.S. state of Arizona, connecting sections in California and New Mexico. The section throughout Arizona is also known as the Purple Heart Trail. It enters Arizona from the west at a crossing of the Colorado River southwest of Kingman. It travels eastward across the northern portion of the state connecting the cities of Kingman, Ash Fork, Williams, Flagstaff, Winslow, and Holbrook. I-40 continues into New Mexico, heading to Albuquerque. The highway has major junctions with U.S. Route 93 (US 93) — the
Arizona State Route 93 approved a request from the Arizona Department of Transportation to eliminate all of US 89 south of Flagstaff. Thus, US 93 was extended to its current southern terminus at US 60 in Wickenburg. At its original northern terminus in Kingman, State Route 93 branched off of U.S. Route 66 (Andy Devine Avenue) at Louise Avenue, which is several miles east of where U.S. Route 93 and U.S. Route 466 branched northwest to Boulder City and Las Vegas. The old two-lane SR 93 headed east, south of and parallel to the new alignment of Interstate 40 until it came to the