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
Arizona State Route 72 Arizona State Route 72 State Route 72 (SR 72) is a state highway in the U.S. state of Arizona. It runs from SR 95 near Parker southeast to U.S. Route 60 (US 60) in Hope. Along its route, the highway is mostly parallel to the Arizona and California Railroad and runs through the community of Bouse in desert terrain. The route was established in 1930 from its current eastern terminus all the way to the California state line, but was truncated in 1965. The route was completely paved by 1940. SR 72 begins at a T-intersection at which SR 95