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 79 Arizona State Route 79 State Route 79 (SR 79), also known as the Pinal Pioneer Parkway, is a state highway in the U.S. state of Arizona. SR 79 has a northern terminus at U.S. Route 60 in unincorporated Florence Junction and passes through the town of Florence, its southern terminus is four miles (6 km) north of Catalina, at State Route 77, north of Tucson. The entirety of SR 79 is a direct surface route, roughly paralleling Interstate 10, (actually a north–south segment of the normally east–west freeway) and serving as the major route to Florence (which has no Interstate