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Methods for determining turning rates in a road network

  • US 7,894,979 B2
  • Filed: 05/24/2006
  • Issued: 02/22/2011
  • Est. Priority Date: 05/31/2005
  • Status: Expired due to Fees
First Claim
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1. A method for determining turning rates in a road network, comprising:

  • measuring traffic volumes at plurality of measurement cross-sections at a plurality predefined measuring intervals;

    dividing the road network at least partially into subnetworks with entries and at least one exit;

    considering at least one subnetwork as a forward-related network;

    formulating a model equation for the forward-related subnetwork in which measurement cross-sections are based upon the at least one exit and the entries of the subnetwork;

    setting an exit traffic volume as a weighted sum of entry traffic volumes, wherein a weighting factor corresponds to forward-related turning rates, the weighting factor specifying the portion of an entry traffic volume flowing out through the at least one exit;

    calculating the forward-related turning rates based upon the model equation;

    accounting the entry traffic volumes of the plurality of past measuring intervals in the weighted sum for the exit traffic volume of a predefined measuring interval; and

    determining a forward-related turning rate based upon a sum of corresponding turning rates of the measuring intervals,wherein the model equation is based upon a mathematical estimation method, andwherein an extended Kalman filter is used in the mathematical estimation method.

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