Electricity: electrical systems and devices – Miscellaneous
Patent
1974-12-26
1978-04-18
Smith, Jr., David
Electricity: electrical systems and devices
Miscellaneous
339 19, H02B 102
Patent
active
040854345
ABSTRACT:
A traffic control system which controls the timing of a plurality of traffic lights at a plurality of intersections with a variety of timing patterns, this invention contemplates utilizing modules which will operate automatically to control the flow of traffic and which also is readily controlled by a master controller for changing traffic flow cycles. The controller which is placed at the intersection is preset or programmed to establish a basic timing cycle. This timing cycle can be changed by the transmission of signals from a master controller and the storage of the signals at the intersection. A single master controller can thereby control a plurality of intersection controllers to vary the traffic flow over a wide area. By using multiplexing techniques, a single pair of signal wires can connect the master and a large number of independent intersection controllers. The individual controllers are designed to accept a plurality of standard plug-in components which are interconnected by a single component. Each of the standard components provides a choice of such things as basic timing cycles by the simple procedure of external switch plugs which can be changed simply, with few tools, in suit. In this manner, once the system is installed, changes in the traffic flow can be compensated by simple changes in the intersection controllers.
REFERENCES:
patent: 231708 (1880-08-01), Gilliland
patent: 2200993 (1940-05-01), Marshall
patent: 3518612 (1970-06-01), Dunman et al.
patent: 3573558 (1971-04-01), Babcock
Marrs Roger A.
Smith Jr. David
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