2-wire push button station control system for a traffic...

Details 2-wire push button station control system for a traffic... 2-wire push button station control system for a traffic...

2006-12-05

2006-12-05

Wu, Daniel (Department: 2612)

Communications: electrical

Pedestrian guidance

C340S407100, C367S116000

Reexamination Certificate

active

07145476

ABSTRACT:
A 2-wire control system which communicates with a plurality of pole mounted push button stations of the kind that are found at a traffic light controlled intersection via existing pairs of underground wires over which power and data signals are transmitted so as to enable a visually impaired pedestrian to receive both audible and tactile signals regarding the flow of vehicular traffic through the intersection. The 2-wire control system includes a central control unit that is located at a traffic light control cabinet and is connected to a standard traffic signal light controller. The control unit includes a plurality of 2-wire output ports that are connected to respective pairs of the plurality of push button stations. The central control unit also includes a corresponding plurality of on/off controls and data interfaces by which each of the 2-wire output ports thereof is provided with the power and data signals to be transmitted to respective pairs of push button stations depending upon the entry of a pedestrian request and the illumination of a WALK or DON'T WALK message.

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