Mobile navigation system

Abstract

In a mobile navigation system, it is possible to judge as to whether or not either a traffic jam region or a traffic restriction region is reduced until a moving object reaches this traffic jam region, or traffic restriction region. The mobile navigation system comprises present position detecting means, map information storage means, route searching means, and traffic information receiving means. Further, the navigation system comprises specific region judging means for judging as to whether or not a traffic jam or restriction region is present within the route searched by the route searching means; arrival time calculating means for calculating time required such that the moving object reaches the traffic jam or restriction region; decreasing time detecting means for detecting time during which the traffic jam or restriction region is decreased based upon the traffic jam or restriction information received by the traffic information receiving means; and re-searching control means for causing the route searching means to re-search the route in accordance with a relationship between the output from the decreasing time detecting means and the output from the arrival time calculating means when the specific region judging means judges that the traffic jam or restriction region is present.