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A U-turn in driving refers to performing a 180° rotation to reverse the direction of travel. It is called a "U-turn" because the maneuver looks like the letter U. In some areas, the maneuver is illegal, while in others, it is treated as a more ordinary turn, merely extended. In still other areas, lanes are occasionally marked "U-turn permitted" or even "U-turn only." Occasionally, on a divided highway, special U-turn ramps exist to allow traffic to make a U-turn, though often their use is restricted to emergency and police vehicles only. In the United States, U-turn regulations vary by state: in Indiana U-turns are allowed as long as the driver follows all of the precautions normally ascribed to making a left turn (yielding right-of-way, etc.). Many places, including Texas and Georgia, have specially designed U-turn lanes (referred to as Texas U-turn lanes). In Michigan, U-turns are required for many left turns to and from divided highways, as part of the Michigan Left maneuver (also referred to as a Michigan Turn). ==Prohibited U-turns== U-turns are often prohibited for various reasons. Sometimes a sign indicates the legality of U-turns. However, traffic regulations in many jurisdictions specifically prohibit certain types of U-turns. Laws vary by jurisdiction as to when a U-turn may or may not be legal. Examples of jurisdictions with codified U-turn prohibitions include the Canadian provinces of Alberta and British Columbia and the U.S. state of Oregon.〔(Section 811.365 of Oregon Driver's Manual )〕 In Alberta, U-turns are prohibited in certain circumstances, for example (ref. Alberta Regulation 304/2002, Division 7): * At the crest of a hill or on a curve unless the driver can see at least 150 m ahead * Anywhere a sign prohibits a U-turn * In urban areas between intersections * At alleys and driveways * At an intersection controlled by a traffic signal (unless signage or signals specifically allow this maneuver) * By a school bus on an undivided highway or on a divided highway where the length of the bus is longer than the width of the median between the two carriageways 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「U-turn」の詳細全文を読む スポンサード リンク
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