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Route calculation method for a vehicle navigation system

  • US 20050222764A1
  • Filed: 03/30/2005
  • Published: 10/06/2005
  • Est. Priority Date: 04/06/2004
  • Status: Active Grant
First Claim
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1. In a vehicle navigation system having an output screen, a method for optimizing a travel route between a first location and a second location based on traffic information from a remote location, comprising the steps of:

  • (a) displaying a travel route between the first and second locations in the output screen;

    (b) determining whether to recalculate the travel route displayed in said step (a);

    (c) calculating an alternative travel route, if the vehicle navigation system determines in said step (b) to recalculate the travel route;

    (d) displaying the alternative travel route in the output screen;

    (e) determining whether a traffic information update has been received from the remote location;

    (f) recalculating the alternative travel route based upon the traffic information update received in said step (e);

    (g) determining whether the alternative travel route recalculated in said step (f) has a shorter estimated travel time from the first location to the second location than the travel route displayed in said step (a); and

    (h) displaying the alternative travel route recalculated in said step (f) in the output screen, if the determination in said step (g) favors the alternative travel route recalculated in said step (f).

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