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Systems and methods to detect vehicle queue lengths of vehicles stopped at a traffic light signal

  • US 10,019,898 B2
  • Filed: 04/05/2016
  • Issued: 07/10/2018
  • Est. Priority Date: 01/14/2016
  • Status: Active Grant
First Claim
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1. A method of detecting a queue length of a vehicle queue at a traffic light signal, the method comprising:

  • calculating a distance between a first Onboard Unit (OBU)-equipped vehicle and a second OBU-equipped vehicle in the vehicle queue associated with the traffic light signal;

    determining whether the distance between the first OBU-equipped vehicle and the second OBU-equipped vehicle is greater than a vehicle length of an OBU-equipped vehicle;

    if the distance is determined greater than the vehicle length, detecting at least one non-OBU-equipped vehicle stopped in the vehicle queue behind the first OBU-equipped vehicle;

    determining the queue length of the vehicle queue based on the first OBU-equipped vehicle, the second OBU-equipped vehicle and an outcome of a comparison between the distance and the vehicle length to control the traffic light signal; and

    transmitting wireless signals from the first OBU-equipped vehicle and the second OBU-equipped vehicle including at least one of vehicle location data, elevation data, direction heading data and speed data to a Roadside Unit (RSU).

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