| 摘要 |
PROBLEM TO BE SOLVED: To decrease an anxiety by finding and navigating an effective substitution route when a vehicle deviates from a searched route. SOLUTION: When the vehicle deviates from the route, a return route is searched for at the side of the vehicle. When the vehicle deviates from the route in a direction from an intersection C123 to a road R224, the return route becomes C133→R134→C134→R234→C124→R233→C113. When a total length of the return route exceeds 1 km, the searching is carried out again at a center. The researching for the route is carried out at the center even when the return route cannot be discovered. |
