TRAFFIC CAUTION DEVICE WHICH MAY IDENTIFY THE RUNNING DIRECTION OF VEHICLE

摘要

The invention discloses a traffic caution device which may identify the running direction of vehicles. The device includes a transmitter and a receiver. The transmitter includes an ultrasonic transmitting unit and a FM stereo transmitting unit. The receiver includes a FM stereo receiving unit, a decoding unit, an ultrasonic receiving unit, a monolithic processor, an analog switch, a recording and reproducing speech unit, a given voltage unit. The device uses ultrasonic wave to identify running direction and speed of vehicles, and can send caution speech information with accuracy to vehicle whose speed must be limited. The device has very stron expanded function which may provide other caution information, large numbers of travel and business information to vehicles. The device may substitute travel caution sign.