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
Unconstructed state routes in Arizona planning maps and all land acquired for right-of-way was subsequently sold, the funds being used to pay for other transportation projects. State Route 76 was a proposed state highway in eastern central Arizona, United States that would have connected State Route 77 and San Manuel. There was a planned extension to Benson which would have been State Route 176. It was designated in 1962 but was never built, and was cancelled in 1988. It would have followed the San Pedro River on its entire length. U.S. Route 93T was a proposed temporary extension of US 93 following US 66 and