Traffic light control apparatus for emergency vehicles

Details Traffic light control apparatus for emergency vehicles Traffic light control apparatus for emergency vehicles

1999-06-28

2000-06-06

Hofsass, Jeffery A.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Transmitter in another vehicle

340904, 340906, 340907, 455228, 455 99, G08G 100

Patent

active

060724064

ABSTRACT:
A traffic light control apparatus for emergency vehicles for enabling control of a plurality of traffic signal lights disposed at a controlled intersection by an operator of an emergency vehicle and for disabling a conventional traffic signal light controller used for controlling the operation of the traffic signal lights. The device includes a relay for disconnecting the conventional traffic signal light controller in response to a disconnect signal, a directional compass disposed in the emergency vehicle for generating a plurality of directional signals, a transmitter for transmitting the directional signals, a data receiver disposed at the controlled intersection for receiving and decoding the directional signals and generating a plurality of input signals, a state machine for accepting the input signals, for generating a plurality of state signals, for generating a plurality of output signals dependent upon the input signals and state signals, and for generating the disconnect signal, and a plurality of relays for energizing the traffic lights responsive to the output signals. An audible alarm located at the controlled intersection is activatable by the operator of the emergency vehicle.

REFERENCES:
patent: 3881169 (1975-04-01), Malach
patent: 4135144 (1979-01-01), Elmasian
patent: 4228419 (1980-10-01), Anderson
patent: 4443783 (1984-04-01), Mitchell
patent: 4775865 (1988-10-01), Smith et al.
patent: 4914434 (1990-04-01), Morgan et al.

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