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In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
Depending on the state, "state highway" may be used for one meaning and "state road" or "state route" for the other. In some countries such as New Zealand, the word "state" is used in its sense of a sovereign state or country. By this meaning a state highway is a road maintained and numbered by the national government rather than local authorities.
The official name is the naming format typically used by the state department of transportation (DOT) or the general public, and is what should be used to refer the highway in article prose. The article title is a disambiguated form obviously used for article naming, and should only be used in article prose if a sentence would otherwise be ...
US 51 uses part of the Jane Addams Memorial Tollway in Illinois; the old road is Illinois Route 251. US 278 uses the tolled Cross Island Parkway in South Carolina; the old road is US 278 Business. The tolls were removed in July 2021. US 301 is a toll road through Delaware; the former routing is a free road and uses several Delaware state routes.
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 ...
The highway system of the United States is a network of interconnected state, U.S., and Interstate highways. Each of the fifty states, the District of Columbia, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands own and maintain a part of this vast system, including U.S. and Interstate highways, which are not owned or maintained at the federal level.
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By the mid-1930s, the state had adopted a more standard system of numbered state highways. [ 5 ] [ 6 ] In 1978, the ITD began using brown state highway markers to denote scenic Idaho highways, [ 7 ] in addition to the main highway markers that featured a black background and white lettering and the name "IDAHO" in black lettering inside a white ...