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The Arizona Department of Transportation (ADOT) internally recognizes Interstate Highways, U.S. Highways and Arizona Highways as all being separate types of highway designations. State highways within Arizona are referred to as Arizona State Routes or State Routes , with the prefix "SR" being used for abbreviations.
In 1979, the American Association of State Highway and Transportation Officials (AASHTO) approved a request from California and Arizona to truncate US 66 from the California state line, east to I-40 and US 666 in Sanders. [25] However, Arizona continued to designate and sign US 66 between Sanders and I-40/US 93 in Kingman. [26]
All of Arizona's existing Interstate Highways have overtaken or replaced some U.S. Routes, which either involved decommissioning or running concurrent with the existing route. The Arizona Department of Transportation (ADOT) is the agency responsible for building and maintaining the Interstate Highways in the Arizona State Highway System.
Main interstate routes include I-17, and I-19 traveling south–north, I-8, I-10, and I-40 traveling west–east, and a short stretch of I-15 traveling southwest–northeast through the northwestern corner of the state. In the future, I-11 travel through Arizona following US 93, it may replace I-19, and will terminate at the Mexican border in ...
State Routes 87, 85, and 74 connect Phoenix with other areas of the Valley and Arizona. [ 7 ] The street system in Phoenix (and some of its suburbs) is laid out in a grid system, with most roads oriented either north–south or east–west, and the zero point of the grid being the intersection of Central Avenue and Washington Street. [ 7 ]
State Route 487 was a state route that never materialized in the north-central part of Arizona. The Arizona Department of Transportation added it the state highway system in 1967 between Flagstaff and State Route 87 near Happy Jack. It did show on state maps during the early 1970s, but the route disappeared in the mid to late '70s.
U.S. Route 93 Spur (US 93 Spur) is a 0.38-mile (0.61 km) long unsigned spur route of US 93 in Kingman. [2] Originally a small section of US 66 , it became part of the Kingman I-40 Business Loop (I-40 BL) on October 26, 1984, upon the decommissioning of the former highway in Arizona. [ 19 ]
Longest state highways by state State Highway mi km References Alabama: State Route 3: 386.449 621.929 [1]Alaska: Route 1: 545.92 878.57 [2]Arizona: State Route 87
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