Communications: electrical – Selective – Having indication or alarm
Patent
1977-03-07
1979-01-16
Yusko, Donald J.
Communications: electrical
Selective
Having indication or alarm
343228, G08G 100
Patent
active
041351444
ABSTRACT:
A radio transmitter activated traffic signal control including a radio transmitter carried in the emergency vehicle and activated to transmit a signal to the traffic signal lights at each intersection approached by the emergency vehicle which in turn activates a relay within the traffic light controls which relay disconnects the normal sequencing controls to the traffic lights and activates a timer delay relay which initially energizes the red light in each traffic signal via a blinker to cause a flashing red signal to be activated at all lights and subsequently, after an adjustable time delay period ranging from 5 to 8 seconds, energizing each red light in a steady mode. After the transmitter signal is sufficiently attenuated by the emergency vehicle proceeding a sufficient distance beyond the intersection, the receiver-activated relay is again de-energized, causing the normal sequencing and timing controls of the traffic signal to again be connected to the traffic lights for normal operation.
REFERENCES:
patent: 2057186 (1936-10-01), Freeberg
patent: 2355607 (1944-08-01), Shepherd
patent: 2881409 (1959-04-01), Cook et al.
patent: 2903674 (1959-09-01), Schwab
patent: 3020522 (1962-02-01), Lesher
patent: 3114127 (1963-12-01), Ramsey
patent: 3257641 (1966-06-01), Campana et al.
Groody James J.
Kirk David L.
Yusko Donald J.
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