Interstate Business Route 10
Transcontinental Interstate 10 has 12 active business loops and several decommissioned business routes. The freeway replaced U.S. 290 west of Harper, Texas, U.S. 190 west of Iraan, Texas and U.S. 80 between Interstate 20 in West Texas and Interstate 8 at Casa Grande. The freeway west from Phoenix, Arizona to Santa Monica, California also displaced portions of U.S. 60, U.S. 66, U.S. 70 and U.S. 99. Most of the remaining I-10 business routes represents old alignments of those U.S. routes.
Arizona | New Mexico | Texas