Emergency traffic signal preempt system

Details Emergency traffic signal preempt system Emergency traffic signal preempt system

1990-06-29

1992-01-21

Crosland, Donnie L.

Communications: electrical

Override of traffic control indicator by command transmitter

340902, 340904, G08G 107

Patent

active

050831259

ABSTRACT:
An emergency situation traffic signal control system, employing true radar and telemetry-based systems, which is a two-way, two frequency, full duplex transmission system. The system consists of an intersection transmitter/receiver electrically coupled to an intersection traffic signal control box and a vehicular transponder. The intersection transmitter/receiver generates an A/DCODE consisting of an access code ("ACODE") and a direction code ("DCODE"). The intersection transmitter/receiver continuously monitors the intersection by sending the A/DCODE signal in the approach directions relative to the intersection. An authorized emergency vehicle transponder approaching the intersection receives the A/DCODE, verifies the accuracy of the codes and re-transmits the DCODE, along with an optional vehicle identification code ("VID"), to the intersection transmitter/receiver for verification. If the vehicle is positively verified, control of the intersection is handed over to the vehicle by engaging valid preempt.

REFERENCES:
patent: 4016532 (1977-04-01), Rose
patent: 4228419 (1980-10-01), Anderson
patent: 4463339 (1984-07-01), Frick et al.
patent: 4914434 (1990-04-01), Morgan et al.

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