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The Segway PT is a two-wheeled, self-balancing transportation device invented by Dean Kamen and unveiled in December 2001. It is produced by Segway Inc. of New Hampshire. The name "Segway" is a homophone in American English of "segue" (a smooth transition, literally Italian for "follows"). PT is an initialism for personal transporter while the old acronym HT was an initialism for human transporter.
Computers and motors in the base keep the Segway upright at all times. Users lean forward to go forward, back to move backwards, and turn by leaning left and right. Segway PTs are driven by electric motors at up to 5.6 m/s (12.5 mph/20 km/h). Gyroscopes are used to detect departures from perfect balance. In laws that regulate it, the applicable category is sometimes called "electric personal assistive mobility device" (EPAMD).

Kamen holds that "walking is a remnant of the Dark Ages, an unpleasant time-waster that technology need eradicate".[1] The Segway is designed to replace larger forms of personal transportation such as automobiles. Kamen has stated that 500 million car trips per day in the United States are of less than 5 miles and single-passenger, and that if only a percentage of those used a tiny electric "car" instead, the positive effects could be considerable.


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