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 from its junction with Interstate 8 in Yuma to the Interstate 8 business loop (which was up until 1977, US 80). The route was turned over to the city of Yuma on April 20, 2007 for maintenance. The road is now Avenue 3E, yet signage for SR 280 remains, including exit signs for Avenue 3E on Interstate 8. SR 280 was the shortest state highway in Arizona, . It existed wholly within the city of Yuma and served the Yuma International Airport. State Route 360 was a state route located in the Phoenix, Arizona area of the United States. From