Communications: electrical – Override of traffic control indicator by command transmitter
Patent
1991-06-24
1993-04-13
Ng, Jin F.
Communications: electrical
Override of traffic control indicator by command transmitter
340903, 340904, 340942, 3408152, 250239, G08G 107
Patent
active
052026833
ABSTRACT:
An optical traffic preemption detector detects pulses of light emitted by an approaching emergency vehicle and provides an output signal which is processed by a phase selector. The phase selector can request a traffic signal controller to preempt a normal traffic signal sequence to give priority to the emergency vehicle. A detector assembly is mounted in proximity to an intersection and can have multiple detector channels. A detector channel can have multiple photocells. A detector housing includes a base, at least one detector turret and a cap. A detector channel circuit includes a circuit board, a photocell with a lens placed over the photocell, and circuitry to produce an output signal.
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Traffic Signal Control Equipment: State of the Art, Transportation Research Board, Washington, D.C., Dec. 1990, pp. 13-15.
Hamer Steven M.
Lunn Thomas J.
Wortman David L.
Barte William B.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Ng Jin F.
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