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State Highway 110 is the shortest route maintained by CDOT with a span of 0.186 miles (0.299 km). The Colorado Department of Transportation (CDOT) is the agency responsible for maintaining the Colorado State Highway System, including Interstate Highways, United States Numbered Highways, and numbered state highways within the state of Colorado. [4]
The longest of these highways is U.S. Highway 160 (US 160), which spans 497.223 miles (800.203 km) [1] across southern Colorado. The standards and numbering for the system are handled by the American Association of State Highway and Transportation Officials (AASHTO) while the routes in the state are maintained by the Colorado Department of ...
Colorado State Highway 103; Colorado State Highway 105; Colorado State Highway 109; Colorado State Highway 110; Colorado State Highway 112; Colorado State Highway 113; Colorado State Highway 114; Colorado State Highway 115; Colorado State Highway 116; Colorado State Highway 119; Colorado State Highway 120; Colorado State Highway 121; Colorado ...
In New Mexico, US 666 absorbed a portion of State Road 32 (NM 32) from Gallup to Shiprock, and completely replaced NM 121 from Shiprock to the Colorado state line. [19] The portion in Colorado was numbered State Highway 106 (SH 106) from the New Mexico state line to Cortez, and SH 10 from Cortez to Utah. [20] [21] At the time, SH 10 traversed ...
In 1925, the Joint Board on Interstate Highways, recommended by the American Association of State Highway Officials (AASHO), worked to form a national numbering system to rationalize the roads. After several meetings, a final report was approved by the U.S. Department of Agriculture in November 1925.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
U.S. Highway 385 (US 385), also known as the High Plains Highway north of Cheyenne Wells, is the easternmost significant north–south state highway in the U.S. state of Colorado, and many of the state's major east–west routes intersect with US 385 before crossing into neighboring Kansas and Nebraska.
U.S. Route 40 (US 40) is a part of the U.S. Highway System that travels from Silver Summit, Utah, to Atlantic City, New Jersey. In the U.S. state of Colorado, US 40 is a major east–west route. It crosses the Rocky Mountains, passing over the Continental Divide at Berthoud Pass before descending to the Front Range.