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Traffic-jam state calculation systems, methods, and programs

  • US 20080234922A1
  • Filed: 03/11/2008
  • Published: 09/25/2008
  • Est. Priority Date: 03/19/2007
  • Status: Active Grant
First Claim
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1. A traffic-jam state calculation system comprising:

  • a controller that;

    obtains probe information, the probe information comprising an average speed of probe cars traveling on each of a plurality of links in a predetermined area;

    detects, for each of the plurality of links, a first degree of a traffic jam corresponding to the link for each of a plurality of different thresholds by comparing the average speed with each of the thresholds;

    obtains traffic-jam information concerning the plurality of links, the obtained traffic information comprising a second degree of the traffic jam corresponding to each of the plurality of links;

    compares, for each of the plurality of links, the second degree of the traffic jam with the first degree of the traffic jam for each of the thresholds;

    selects, for the predetermined area, a threshold from the plurality of thresholds for which the first degree of the traffic jam most matches the second degree of the traffic jam; and

    utilizes the selected threshold to determine a severity of the traffic jam for each of the plurality of links.

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