Mobile unit detection system

摘要

A mobile unit detection system or information system in which the existence of a car or other mobile unit which must be paid attention to can be detected only upon receiving a necessary signal. The mobile unit detection system or information system detects a mobile unit through communication between the car and the mobile unit. The car includes a device for judging the operating condition of the car and transmitting a detection signal based on the result. The mobile unit may transmit a response signal upon receiving the detection signal so that the car is able to detect the existence of the mobile unit.