
Personal rapid transit (PRT), also called podcar, is a public transport mode featuring small automated vehicles operating on a network of specially built guide ways. PRT is a type of automated guideway transit (AGT), a class of system which also includes larger vehicles all the way to small subway systems. PRT vehicles are sized for individual or ...
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http://en.wikipedia.org/wiki/Personal_rapid_transit

(from the article `mass transit`) There have been many proposals, and some field implementations, of small (3–5-passenger), automated vehicles operating on separate, usually elevated, ...
Found on
http://www.britannica.com/eb/a-z/p/48
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