Method and system for regulating switching of a traffic light

• US 6,064,319 A
• Filed: 10/22/1998
• Issued: 05/16/2000
• Est. Priority Date: 10/22/1998
• Status: Expired due to Term

• Current Assignee: Conduent Business Services, LLC (Conduent, Inc.)
• Original Assignee: Orbital Sciences Corporation (Northrop Grumman Corporation)
• Inventors: Matta, David M.
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): GOINS, DAVETTA WOODS
• Application Number:
  US09/177,783
• Time in Patent Office: 572 Days
• Field of Search: 340/917, 340/990, 340/995, 340/906, 340/902, 340/600, 364/436, 364/424.01, 364/454
• US Class Current: 340/917
• CPC Class Codes: G08G 1/07 Controlling traffic signals
• CPC Class Codes: G08G 1/087 Override of traffic control, e.g. by signal transmitted by an emergency vehicle

Abstract

A method and system for regulating switching of a traffic light includes determining the location of a vehicle. The method and system further includes transmitting an information signal comprising information related to the vehicle in response to determining the location of the vehicle. The method and system includes determining whether the traffic light should be switched based on the information signal. Finally, the method and system includes switching the traffic light if necessary in response to determining whether the traffic light should be switched.

Claims

1. A method of regulating traffic controllers, comprising:

storing in a vehicle tracking unit one or more virtual detection loops;

storing in the vehicle tracking unit one or more traffic controller locations;

determining the location of a vehicle;

determining from the location of the vehicle entry of the vehicle into one of the stored virtual detection loops;

determining when one of the traffic controllers requires preemption in favor of a vehicle that has entered one of the stored virtual detection loops;

transmitting in response to a determination that a vehicle has entered one of the stored virtual detection loops and a traffic controller requires preemption, an information signal to a control system, the information signal including the location of the vehicle; and

analyzing the information signal to preempt the traffic controller in favor of the vehicle that has entered one of the stored virtual detection loops.

2. A method of regulating traffic controllers as set forth in claim 1, further comprising:

defining each of the one or more stored virtual detection loops by latitude and longitude coordinates.

3. A method of regulating traffic controllers as set forth in claim 1 wherein analyzing the information signal comprises:

prioritizing information signals received from a plurality of vehicles.

4. A method of regulating traffic controllers as set forth in claim 1, wherein transmitting the information signal comprises transmitting information including an identity of the vehicle, location of the vehicle, direction of travel of the vehicle, speed of vehicle, and time of transmission of the information signal.

5. A vehicle traffic control system for preempting a traffic controller in favor of an identified vehicle, comprising:

a vehicle position detector mounted in a vehicle, said vehicle position detector responsive to location signals for generating a vehicle position signal;

a vehicle tracking unit mounted in the vehicle, said vehicle tracking unit storing one or more virtual detection loops defined by latitude and longitude coordinates, said vehicle tracking unit further storing one or more traffic controller locations;

said vehicle tracking unit comparing the vehicle position signal with one or more of the virtual detection loops to determine when the vehicle has entered one of the stored virtual detection loops and further determining when one of the traffic controllers requires preemption in favor of a vehicle that has entered one of the stored virtual detection loops;

a control system for analyzing one or more information signals to determine whether to preempt a traffic controller in favor of a vehicle that has entered one of the stored virtual detection loops; and

an information signal transmitter mounted in the vehicle, said information signal transmitter responsive to a determination that a vehicle has entered one of the stored virtual detection loops and a traffic controller should be preempted to transmit an information signal to the control system, the information signal including the location of the vehicle.

6. A vehicle traffic control system as set forth in claim 5 further comprising:

a route editor for inputting to the vehicle tracking unit latitude and longitude coordinates of the one or more stored virtual detection loops.

7. A vehicle traffic control system as set forth in claim 6 further comprising:

a control head for user input of information to the vehicle tracking unit.

8. A vehicle traffic control system as set forth in claim 5 wherein the control system further comprises:

a control system computer for prioritizing information signals received from a plurality of vehicles.

9. A vehicle traffic control system as set forth in claim 5 wherein the control system further comprises:

an information signal synchronizer for synchronizing information signals for analysis to determine whether to preempt a traffic controller.