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Method of controlling a traffic control system and a traffic control system for use of the method

  • US 4,750,129 A
  • Filed: 07/01/1985
  • Issued: 06/07/1988
  • Est. Priority Date: 07/02/1984
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring traffic in a traffic control system including at least two mutually spaced measuring points arranged along a traffic lane with a signalling means located between the measuring points, the method comprising the steps of detecting the speeds Vc of vehicles passing the measuring points,determining a running weighted average speed Vg from detected vehicle speeds Vc,determining whether a detected vehicle speed is less than a predetermined part of the running weighted average speed Vg, and applying an alarm signal to the signalling means when the detected vehicle speed is less than the predetermined part of the running weighted average speed Vg, the improvement comprising,determining a running weighted average speed Vg (m-1) from vehicle speeds Vc (m-1) detected at measuring point (m-1), located upstream in the traffic direction of the traffic lane, which is one of two consecutive measuring points (m-1, m) along the traffic lane and, wherein the step of determining whether the detected vehicle speed is less than a predetermined part of a running weighted average speed Vg, comprises comparing the speed of a vehicle Vc (m) detected at the downstream measuring point (m) of the two consecutive measuring points (m-1, m) with the predetermined part of the running weighted average speed Vg (m-1) determined from the vehicle speed Vc (m-1) detected at the measuring point (m-1), located upstream in the traffic direction of the traffic lane, of the two consecutive measuring points (m-1, m).

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