Communications: electrical – Selective – Having indication or alarm
Patent
1977-06-03
1979-07-24
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
328 72, 340 34, 340147LP, G08G 107
Patent
active
041624777
ABSTRACT:
A multiple priority remote control system for the remote control of a traffic signal control system for a traffic intersection responsive to optical signals transmitted by optical energy transmitters carried on designated vehicles operating along the roadways of the intersection. The remote control system includes signal discriminator circuitry for producing high or low control signals dependent upon the particular optical signal that is detected and in accordance with the roadway of the intersection from which the detected optical signal is received. A control circuit connected to the controller for the traffic signal control system and to the discriminator circuitry responses to the control signals to provide a green light to the vehicle transmitting the first of two detected low priority signals or the first of two detected high priority signals or the high priority signal of detected high and low priority signals.
REFERENCES:
patent: RE28100 (1974-08-01), Long
patent: 2355607 (1944-08-01), Shepherd
patent: 2881409 (1959-04-01), Cook et al.
patent: 3833884 (1974-09-01), Bigbie et al.
patent: 4016532 (1977-04-01), Rose
"Safety at the Signal", 3M Company, Jan. 1970.
Alexander Cruzan
Caldwell Sr. John W.
Groody James J.
Marben Robert L.
Minnesota Mining and Manufacturing Company
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