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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.
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 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.
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 95 was a late addition to Arizona's U.S. Highway system, having been extended into the state around 1960 during the dawn of the Interstate Highway System. [6] [7] Though it is a short section of highway, only traveling between Ehrenberg and San Luis at the Mexico–United States border, it also serves as the main north–south highway to the cities of Yuma, San Luis, and Quartzsite. [2]
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.
Exceptions to this were through the central business districts of the cities and towns that US 66 passed through, and I-40 had to be built as a bypass outside the cities. On October 26, 1984, after the last section of I-40 was completed in Williams, US 66 was removed from the state highway system of Arizona.
In 1955, the highway was extended to Lukeville at the Mexican border with an overlap with SR 86 between Ajo and Why when a county road was added to SR 85. [ 12 ] In 1973, the connector between I-10 and Buckeye Road was established, and was redesignated in 1978 as a spur route of SR 85. [ 13 ]