Recorder of the status of a traffic control system

Details Recorder of the status of a traffic control system Recorder of the status of a traffic control system

1981-02-24

1983-05-10

Swann, III, Glen R.

Communications: electrical

Selective

Having indication or alarm

315132, 340642, B60Q 900

Patent

active

043832407

ABSTRACT:
A recorder of the states of a traffic control system which stores and visually displays the current operational state of the system. The current states of the command signals produced by the traffic controller of the system and the current states of energization of each traffic signal light, after a predetermined delay, are stored in a bistable device. The occurrence of an error, conflicting or improper timing of the energization of the traffic lights of the system or of the command signals controlling the energization of such lights are sensed by a conflict monitor. Upon the occurrence of an error, the bistable devices are latched, i.e. prevented from thereafter changing state. The state of each bistable device is visually displayed as of the occurrence of an error.

REFERENCES:
patent: 3629802 (1971-12-01), Clark et al.
patent: 3778762 (1973-12-01), Jarko et al.
patent: 4135145 (1979-01-01), Eberle
patent: 4307392 (1981-12-01), Loshbough et al.

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