Traffic signal preemption system

Details Traffic signal preemption system Traffic signal preemption system

1988-06-13

1990-04-03

Crosland, Donnie L.

Communications: electrical

Override of traffic control indicator by command transmitter

340902, 340907, G08G 107

Patent

active

049144340

ABSTRACT:
When placed into operation by the occupants of an emergency vehicle, a vehicle transmission system having a directional antenna sends out a series of UHF messages spaced apart by varying lengths of time and identifying the emergency vehicle, its priority, and its direction, or indicating that the vehicle is travelling along a pre-planned route. At each signal-controlled intersection, a vehicle detection, identification, and preemption system having an omnidirectional antenna and containing information identifying vehicles authorized to preempt the intersection and their pre-planned directions of travel receives these messages from plural vehicles and determines when and in favor of which direction and for how long the intersection is to be preempted.

REFERENCES:
patent: 3257641 (1966-06-01), Campana et al.
patent: 3638179 (1972-01-01), Coll et al.
patent: 3886515 (1975-05-01), Cottin et al.
patent: 4016532 (1977-04-01), Rose
patent: 4228419 (1980-10-01), Anderson
patent: 4230992 (1980-10-01), Munkberg
patent: 4443783 (1984-04-01), Mitchell
patent: 4573049 (1986-02-01), Obeck

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