Patent ID: 9026368
Filing Date: 2015-05-05
Classification: G01C

Abstract:
1. A vehicle navigation system comprising: a route guidance function element for searching an optimum route from a current position of a vehicle to a destination according to a normal level map data and for guiding the optimum route by displaying the optimum route on a map screen image of a display; a deviation route retrieving element for retrieving a deviation route, which has a possibility that a user may deviate from the optimum route as a normal route to the destination recommended by the route guidance function element and enter into the deviation route although the vehicle is incapable of driving into the deviation route from the normal route; and an attention notification element for outputting attention notification information in order to prevent the user from entering into the deviation route when the route guidance function element guides the optimum route to the destination, wherein the deviation route retrieving element calculates a difference between the normal route and a traffic regulation invalidation route so that the deviation route retrieving element retrieves a part of the traffic regulation invalidation route, which deviates from the normal route, as the deviation route, wherein the normal route is obtained by searching the optimum route from the current position to the destination recommended by the route guidance function element with using the normal level map data for navigation, wherein the traffic regulation invalidation route is obtained by searching a route from the current position to the destination with using a traffic regulation invalidation map data, which is a lower level than the normal level map data, and wherein the traffic regulation invalidation map data is prepared by invalidating traffic regulation information in the normal level map data and setting a node at a grade separation intersection to connect roads at the grade separation intersection.