Automatic determination of traffic signal preemption using GPS,

Details Automatic determination of traffic signal preemption using GPS, Automatic determination of traffic signal preemption using GPS,

1997-07-15

1999-11-16

Hofsass, Jeffery A.

Communications: electrical

Override of traffic control indicator by command transmitter

340907, 340988, 701201, 701213, G08G 107

Patent

active

059865750

ABSTRACT:
For qualification for traffic preemption an area is defined and if the vehicle is in the area it can obtain preemption. The vehicle's position is determined, in one embodiment, by use of differential GPS.

REFERENCES:
patent: 4449116 (1984-05-01), Hill et al.
patent: 5014052 (1991-05-01), Obeck
patent: 5083125 (1992-01-01), Brown et al.
patent: 5452212 (1995-09-01), Yokoyama et al.
patent: 5539398 (1996-07-01), Hall et al.

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