04350969 is referenced by 72 patents and cites 8 patents.

Each vehicle of a transportation system is provided with a radio transmitter providing electable and different sequences of signals, one part of the signal identifying the vehicle, and another changing sequence of signals, either under operator control or automatically by attachment to the odometer, to indicate the present position of the vehicle on a scheduled route. The home of a passenger desirous of meeting a particular vehicle at a particular pickup point is provided with a radio receiver with selectable detectors which can be set to detect the signals from a particular vehicle transmitter, and provide a visual or audible indication of the present position of the vehicle on the scheduled route. Pre-specified settings of the receiver, and corresponding detectable signals, inform a passenger of no service or delayed service.

Vehicle identification and position signalling system in a public transportation system
Application Number
Publication Number
Application Date
March 31, 1980
Publication Date
September 21, 1982
William H Greer
Daheim Rd., Millbrook, 12545
Robert W Berray
G08C 21/00
G08G 1/12
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