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Vehicular navigation system

  • US 6,466,867 B1
  • Filed: 03/15/2000
  • Issued: 10/15/2002
  • Est. Priority Date: 03/18/1999
  • Status: Active Grant
First Claim
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1. A navigation system comprising:

  • following-the-road judgment means for judging whether a continuity of a travel road is secured before and after a particular intersection when a vehicle passes through the particular intersection existing on a recommended guidance route, and for determining the particular intersection as an intersection to be guided when the continuity of the travel road is not secured;

    ramp judgment means for, even when the particular intersection is not determined as the intersection to be guided by the following-the-road means, determining the particular intersection as the intersection to be guided, when the particular intersection is a branch point at which an off-ramp is connected to a main lane to divide traffic on the main lane to the off-ramp, and when there is a merge point at which traffic is merged to the main lane within a predetermined distance ahead of the branch point, and further when the recommended guidance route is set so that the vehicle continues to travel on the main lane;

    travel guidance performing means for performing travel guidance regarding the intersection to be guided, which is determined by one of the following-the-road judgment means and the ramp judgment means, when the vehicle approaches the intersection to be guided;

    wherein the ramp judgment means first judges whether a certain intersection on the recommended guidance route is the merge point or not, and when the certain intersection is the merge point, the ramp judgment means uses another particular intersection existing within the predetermined distance on the recommended guidance route from the certain intersection as a possible particular intersection to be judged.

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