Patent ID: 6947839
Filing Date: 2005-09-20
Classification: G01C

Abstract:
1. A navigation system comprising: position detector for detecting the current position of a mobile unit, map information acquisition section for acquiring map information, traffic restriction information acquisition section for acquiring traffic restriction information, time information acquisition section for acquiring current date, day of week, and time information, input section for entering a route point, route searching section for searching for an optimum route passing through the route point from the current position at the current date, day of week, and time based on the map information and the traffic restriction information, and output section for guiding a user through the found route by display or voice, wherein said route searching section includes; area determination section for determining whether an area of the current position is an urban area or a suburban area, setting section for setting a predetermined area or a predetermined time responsive to the determination result, and restriction presence or absence determination section for determining the presence or absence of restriction on each time restriction road depending on whether or not a time restriction road exists in the predetermined area centering around the current position and whether or not a restriction time period of the time restriction road overlaps a time period in the predetermined time from the current time, and if the restriction presence or absence determination section determines the presence of restriction, said route searching section searches for a route avoiding the time restriction road.