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(countable noun) Usage note: This is the usual term used by all speakers.
A concrete track designed to let buses travel quickly between major points in a town. Buses are specially adapted to use the O-Bahn and are guided automatically along the concrete track. Other traffic is not allowed to use the O-Bahn.
Example: What surprised me was the "O-Bahn" system, originally from Germany. There are small wheels on the sides of an ordinary shuttle bus, which allow it to move onto a special track. Once on the track, the driver does not have to operate the steering wheel. (http://nobuteru.or.jp/english/topics/topics_02.html)
An O-Bahn bus on the track in Adelaide
(photo by Julia Miller)