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System and method for estimating impedance time through a road network

  • US 20050125143A1
  • Filed: 12/08/2004
  • Published: 06/09/2005
  • Est. Priority Date: 12/11/2001
  • Status: Abandoned Application
First Claim
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1. A navigation system comprising:

  • a server including—

    a memory for at least temporarily storing at least a portion of data structure having data indicative of a roadway network of roads intersecting at nodes, the data structure including feature data indicative of traffic characteristics for associated roads, and a server processor accessing the memory and calculating, from the data structure, a route through the roadway network between geographic locations based on data indicative of route impedances associated with selected roads in the roadway network, the server processor estimating node impedances for intersection nodes through which the route travels; and

    a navigation device operable to transmit the geographic locations to the server and receive the route from the server over a communications link.

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