Method and system for providing alternate routes with a navigation system

  • US 6,317,685 B1
  • Filed: 03/13/2000
  • Issued: 11/13/2001
  • Est. Priority Date: 03/13/2000
  • Status: Expired due to Term
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First Claim
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1. A program, for use with a vehicle navigation system capable of calculating a route from an origin to a destination, estimating a time of travel from said origin to said destination, and determining a location of a vehicle and an actual time of travel of said vehicle along said route, comprising:

  • means for determining whether the actual time of travel of said vehicle to a position along said route exceeds an estimated time of travel to said position along said route by a threshold amount of time; and

    means for automatically initiating calculation of one or more alternate routes to said destination when said actual time of travel exceeds said estimated time of travel by said threshold amount of time.

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