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Method and system for mapping traffic congestion

  • US 20020082767A1
  • Filed: 11/30/2001
  • Published: 06/27/2002
  • Est. Priority Date: 03/08/1999
  • Status: Active Grant
First Claim
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1. A method of determining an indication of average length, over a time period, of a queue of vehicles on a road, using probe reports of probes transmitted according to a predetermined protocol, associated with the probe reports, to a mapping system which processes the probe reports, wherein a report includes a characteristic value of position of the probe, the method comprising:

  • (a) constructing with the mapping system a plurality of mapping samples, (b) determining for each of the plurality of mapping samples a position that relates to the farthest probe position from a mapping focus;

    (c) choosing from the position determined in (b) the position which is the farthest from the mapping focus for determining an indication on length of the queue; and

    wherein the process of gathering position related updates from probes, associated with the construction of mapping samples, is being made through a dedicated radio channel in which probes transmit signals in pre-assigned slots in accordance with their position and other criteria, determined by a pre determined protocol.

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