Emergency vehicle control system traffic loop preemption
First Claim
1. A method for preempting traffic signals at an intersection comprising:
- detecting an emergency vehicle at a first intersection via an embedded inductive traffic loop; and
invoking a transmitter coupled to the traffic loop for transmitting position information to the emergency vehicle responsive to the detection of the emergency vehicle at the first intersection, the emergency vehicle forwarding the position information to a traffic controller at a second intersection;
wherein said traffic controller preempts traffic signals for controlling flow of traffic at the second intersection based on information on one or more positions transmitted by the emergency vehicle.
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0 Petitions
Accused Products
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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Citations
17 Claims
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1. A method for preempting traffic signals at an intersection comprising:
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detecting an emergency vehicle at a first intersection via an embedded inductive traffic loop; and invoking a transmitter coupled to the traffic loop for transmitting position information to the emergency vehicle responsive to the detection of the emergency vehicle at the first intersection, the emergency vehicle forwarding the position information to a traffic controller at a second intersection; wherein said traffic controller preempts traffic signals for controlling flow of traffic at the second intersection based on information on one or more positions transmitted by the emergency vehicle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for preempting traffic signals for controlling the passage of an emergency vehicle comprising:
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a traffic controller for controlling the operation of traffic signals at a second intersection; an inductive traffic loop at a first intersection detecting presence of an emergency vehicle at the first intersection; a transmitter coupled to the traffic loop and transmitting position information to the emergency vehicle responsive to the detection of the emergency vehicle at the first intersection; a transceiver in said emergency vehicle receiving the position information from said transmitter and forwarding said position information to said traffic controller at the second intersection; wherein said traffic controller preempts traffic signals at the second intersection based on information on one or more positions transmitted by the emergency vehicle. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for preempting traffic signals for controlling the passage of emergency vehicles comprising:
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a traffic controller for controlling the operation of traffic signals at a second intersection; an inductive traffic loop at a first intersection detecting presence of an emergency vehicle at the first intersection; a transceiver coupled to the traffic loop, the transceiver being actuated to transmit a first signal in response to the detection of the emergency vehicle by said inductive loop; a transponder on said emergency vehicle activated by the first signal transmitted by said transceiver and transmitting a second signal providing information about the emergency vehicle to said transceiver, said transceiver transmitting a third signal providing position information of the emergency vehicle to said traffic controller; wherein said traffic controller preempts traffic signals at the second intersection based on the position information of the emergency vehicle. - View Dependent Claims (15)
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16. A method for preempting traffic signals at an intersection comprising:
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detecting an emergency vehicle at a first intersection via an inductive traffic loop; transmitting a first signal via a first transponder coupled to the traffic loop in response to the detection of the emergency vehicle; activating a second transponder on the emergency vehicle based on the first signal and transmitting a second signal by the second transponder in response, the second signal providing information about the emergency vehicle; and transmitting a third signal by the first transponder in response to the second signal, the third signal providing position information of the emergency vehicle to a traffic controller at a second intersection, wherein the traffic controller preempts traffic signals at the second intersection based on the position information of the emergency vehicle. - View Dependent Claims (17)
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Specification