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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 current routing of US 160 was originally designated as Navajo Route 1 (N1) in late 1958, but had yet to be constructed east of Tuba City.Also known as the Navajo Trail, the route was slated to run from U.S. Route 89 (US 89) to the Arizona–New Mexico state line near the Four Corners Monument.
The road headed north toward Tempe to U.S. Route 80. [14] Between 1951 and 1958, the road was extended south to its current terminus at SR 84; at this time, I-10 had still not been built, nor had the route become a state highway. [15] By 1971, I-10 was finished through the south and east edges of the Phoenix area. [16]
All state highways are designated by the Washington State Legislature and codified in the Revised Code of Washington (RCW), namely Chapter 47.17 RCW. These routes are defined generally by termini and points along the route; WSDOT may otherwise choose the details, and may bypass the designated points as long as the road serves the general vicinity.
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]
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.
The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington. [1] [3] In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather ...
The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR). It was created in 1964 to replace an earlier numbering scheme and ratified by the state legislature in 1970. The system's 196 highways are almost entirely paved, with the exception of a gravel section on SR 165.