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J-turn
A J-turn is a driving maneuver in which a reversing vehicle is spun 180 degrees and continues, facing forward, without changing direction of travel. The J-turn is also called a "moonshiner's turn" (from the evasive driving tactics used by bootleggers), a "reverse 180", a "Rockford Turn", a "Rockford Spin", or simply a "Rockford" popularized by the 1970s TV show ''The Rockford Files''.〔http://jalopnik.com/5737615/how-to-do-a-j+turn-in-the-snow〕 A J-turn differs from a bootleg turn in that the vehicle begins in reverse gear. It is often performed by stunt drivers in film and television shows. It can be performed both on dry and snowy surfaces; the latter is preferable while learning the skill. It is a basic maneuver that leads into the K-turn, also known as the three-point turn, which is the opposite of the J-turn and is performed in a forward-moving car.
==Technique==
The turn is achieved by transferring the momentum of the car by reversing quickly in a straight line then turning the wheel sharply while using the foot brake to lock the front wheels. The driver changes into a forward gear as the nose comes about.〔http://www.wired.co.uk/magazine/archive/2009/08/how-to/how-to-do-a-j-turn How to do a J-turn〕
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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