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1977 Utah state route renumbering
In 1977, the Utah State Legislature changed its system of how state route numbers were used and assigned. Prior to 1977 Utah used a system where every U.S. Highway and Interstate Highway traversing the state was also assigned a different Utah state route number. This state route number was not posted on signs but was only used for legislative purposes, such as funding.〔(【引用サイトリンク】Utah Highways - Route Overlays )〕 There were many instances where having different route numbers for signing and legislative purposes could cause confusion. For example, the highway signed Interstate 15 in Utah was legislatively defined as State Route 1, not route 15. State Route 15 also existed, but was a different route that passed through Zion National Park.〔(【引用サイトリンク】Highway Resolutions )〕
In 1977, the state changed to a system where all highways would have the same legislative route number as its signed route number. For example, Interstate 15 would also be route 15 for legislative purposes. Many state routes were re-numbered to eliminate instances where a state route used the same number as a U.S. Highway or Interstate Highway traversing the state.
In cases where 2 or more routes overlapped, only one of the route numbers sharing the same roadbed would be used in the legislative designation. The other routes in the overlap would have a discontinuity in the legislative description. For example, the stretch of highway between Green River and Crescent Junction is legislatively designated only Interstate 70. The other highways using this same pavement, U.S. Route 6, U.S. Route 50 and U.S. Route 191 all have legislative gaps in their routes for this portion.
Though the law was changed in 1977, most signs changed over in 1978.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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