Interstate 10 in Arizona 2013. The remainder of the old US 80 section was rebuilt to interstate standards, with completion in 2014. East of Tucson, I‑10 parallels and in some cases overlies old US 80 to Benson, and was originally co-signed as US 80 and SR 86. The section of I-10 from Valencia Road to Rita Road was the first construction project in the state of Arizona funded by the Federal Aid Highway Act of 1956. Construction began in 1957 and was completed in 1960. From Benson, the Interstate follows the Southern Pacific mainline east through Willcox and Bowie to New Mexico, rather than
Former state routes in Arizona 1970 to 1992, SR 360 was assigned along the Superstition Freeway from Interstate 10 in Tempe through Mesa to U.S. Route 60 in Apache Junction. In 1992, US 60, which entered the Phoenix area on surface streets north of SR 360, was realigned onto the Superstition Freeway, replacing SR 360 in its entirety. State Route 364, also known as SR 364, was a state highway in the northeastern corner of the state of Arizona, starting in the town of Teec Nos Pos and ending at the state-line near the Four Corners. It first appeared on a state map in 1962