Emergency vehicle control system traffic loop preemption
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United States of America Patent
Stats
-
Sep 26, 2006
Issued Date -
N/A
app pub date -
Apr 8, 2003
filing date -
Apr 9, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An emergency vehicle traffic signal preemption system using existing inductive traffic loops that is either 'car-active' or 'car-passive'. In the 'car-active' system, a passive element having position information transmits an ID tag and the position information to a transceiver in the vehicle when an emergency vehicle is detected by the existing inductive traffic loop. In the 'car-passive' system, a transceiver at the intersection is activated to send an excitation signal to a transponder on the emergency vehicle. The transponder responds with the emergency vehicle ID. The transceiver in the vehicle in the 'car-active' system or the transceiver at the intersection in the 'car-passive' system, transmit position information to the traffic controller to preempt operation of the traffic signals.
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Cited Art Landscape
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