Detection system for emergency vehicles with signal preemption m

Details Detection system for emergency vehicles with signal preemption m Detection system for emergency vehicles with signal preemption m

1980-07-07

1982-03-23

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 32, G08G 107, G08G 101

Patent

active

043215890

ABSTRACT:
A system for detecting emergency vehicles and providing an apparatus for preempting traffic signals at intersecting streets to assure right-of-way in the direction of travel of emergency vehicles. The apparatus or system includes an alternating current generator installed on emergency vehicles to generate an alternating magnetic field surrounding the vehicle at a frequency or coded frequencies reserved for emergency vehicles and an emergency vehicle detection system which detects only alternating magnetic fields with a frequency or coded frequencies radiated by emergency vehicles.

REFERENCES:
patent: 2355607 (1944-08-01), Shepherd
patent: 3090042 (1963-05-01), Kleist et al.
patent: 4016532 (1977-04-01), Rose
patent: 4038633 (1977-07-01), King

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