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Navigation system with switching between an ordinary road preferential mode and a tall road preferential mode

  • US 5,991,689 A
  • Filed: 04/29/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 06/03/1996
  • Status: Expired due to Term
First Claim
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1. A navigation apparatus for a vehicle which provides route guidance based on a preset route, comprising:

  • information storage means in which map information is stored;

    present position detection means for detecting the present position of a vehicle;

    input means for inputting a start point, a destination and an enroute point and for designating, as a determination mode, an ordinary-road-preferential mode or a toll-road-preferential mode;

    route determination means for determining a route based on the map information stored in said information storage means and the determination mode input by said input means, the route starting from the present position of the vehicle detected by said present position detection means or the start point input by said input means and reaching the enroute point or the destination input by said input means; and

    control means for providing route guidance based on the route determined by said route determination means, whereinwhen the vehicle has deviated from a route determined in the ordinary-road-preferential mode and starts traveling on a toll road while route guidance is being provided based on the determined route, said route determination means determines a new route to the destination or the enroute point after changing the determination mode from the ordinary-road-preferential mode to the toll-road-preferential mode.

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