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The Arizona State Highway system was introduced on September 9, 1927, by the State Highway Commission (formed on August 11 of the same year). It incorporated the new federal aid system and also the U.S. Highway system. The 1927 plan included 27 state routes, most of which were simply dirt roads.
Five Interstates were planned in Arizona to supplant or bypass existing U.S. Highways. US 60 between Ehrenberg and Phoenix was to be replaced by the western section of the newly planned Interstate 10 (I-10), I-8 and the eastern section of I-10 were to bypass or replace the entirety of US 80, I-40 was to replace the entirety of US 66, I-17 and I ...
U.S. Route 60 (US 60) is an east–west United States Highway within Arizona. The highway runs for 369 miles (594 km) from a junction with Interstate 10 near Quartzsite to the New Mexico state line near Springerville. As it crosses the state, US 60 overlaps at various points: I-17, I-10, SR 77, SR 260, US 191, and US 180.
The Arizona Department of Transportation (ADOT) is the agency responsible for building and maintaining the Interstate Highways in the Arizona State Highway System. These highways are built to Interstate Highway standards , which are freeways that have a 75-mile-per-hour (121 km/h) speed limit in rural areas and a 65 mph (105 km/h) speed limit ...
The Yuma–Duncan route became part of the transcontinental Southern National Highway auto trail in 1913. In 1914, Arizona's highway system was further reorganized into a better-funded and organized network of early state highways. The Yuma–Duncan route between Globe and New Mexico was added to the newly designated Roosevelt Dam Highway.
The highway has major junctions with U.S. Route 93 (US 93; the main highway connecting Phoenix and Las Vegas, Nevada) in Kingman and again approximately 22 miles (35 km) to the east and I-17 (the freeway linking Phoenix to northern Arizona) in Flagstaff. For the majority of its routing through Arizona, I-40 follows the historic alignment of US 66.
The northern segment (the Mohave Valley Highway) begins at the Colorado River bridge across from Needles, then goes directly northbound to Bullhead City, terminating at its junction with State Route 68 north of town. [1] There is a short SR 95 Truck at Parker, formerly a section of Arizona State Route 72, connecting to California State Highway 62.
Good Roads Everywhere: A History of Road Building in Arizona, including maps in the map PDF and appendix A; History of the Arizona State Highway Department, gives key dates and lengths of routes between 1927 and 1938 as well as a detailed history on the origins of the Arizona State Highway system; Arizona Transportation History; Arizona Roads maps