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
State highways deleted by the Utah State Legislature in 1969 1969 and immediately reassigned to old SR-2 (US-40) through Wendover. State Route 63A went from State Route 63/US-50 in Scipio to SR-1/I-15. This was deleted in 1969. State Route 64 - River Road from the Arizona state line north to SR-1 (US-91) in St. George - was added to the state highway system on May 12, 1931. It initially ran through St. George via 700 South, 700 East, 300 South, and 200 East, but was moved to use 700 East all the way to SR-1 (100 North) on January 25, 1963. After its deletion in 1969, the number was not