| 摘要 |
PROBLEM TO BE SOLVED: To provide a system that outputs a wrong-way travel alarm in a one-way road of a motor highway using a running trajectory information recording function of an existing in-vehicle car navigation system. SOLUTION: The existing in-vehicle car navigation system includes a function to record running trajectory information. Map information for motor highways are provided in the system. A vehicle cannot return the route already passed, so that the system outputs the alarm of wrong-way travel if the vehicle approaches the running trajectory information or travels in the direction same as the trajectory. COPYRIGHT: (C)2010,JPO&INPIT |
