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An official alternate route is a special route in the United States that provides an alternate alignment for a highway. They are loop roads and found in many road systems in the United States including the U.S. Highway system and various state and county route systems. Alternate routes were created as a means of connecting a town (or towns) desired to be on a route which had been routed differently so as to put another important town or city on the route. Originally, the term for these routes was "optional"; but in 1959, the American Association of State Highway and Transportation Officials (AASHTO) changed the designation to "alternate". In some cases where needed, an additional business route exists as a third alignment (this was the case with former U.S. Route 71 Alternate, which bypassed Joplin, Missouri). AASHTO defines and specifies that alternate routes of the U.S. Route system should have the following behavior:
In at least one case, the banner "Optional Route" was retained when a second alternate route existed. One example of this occurred in Kansas City, Missouri with U.S. Route 40 which had an alternate and an optional route simultaneously. In some US states, an alternate route will be designated by adding an "A" after the number instead of a sign marked "Alternate" above it. Example: "US 69A" means "US 69 Alternate". ==See also== * * List of business routes of the Interstate Highway System * Bypass (road) * List of bannered U.S. Routes 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alternate route」の詳細全文を読む スポンサード リンク
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