| 摘要 |
PURPOSE:To attain ease of receiving of the broadcast in the progressing direction without complicated tuning operation of a receiver by starting the receiving of a traffic information broadcast only when the receiving is performed in the order of a trigger signal and an identification signal at the same frequency. CONSTITUTION:A broadcast section Y is determined on a road, and a start point position identification signal transmission antenna 10, running direction identification signal transmission antenna 12, and a traffic information broadcast transmission antenna 14 are arranged sequentially from a start point Xs to an end point XE. A start position identification signal (trigger signal) 100, running direction identification signal 102, and a traffic information broadcast 104 are transmitted, respectively at the same frequency from each antenna. When a car runs on the section Y, the trigger signal 100 is received at first, then the identification signal 104 is transmitted and finally the traffic information broadcast is received automatically. Thus, the traffic information in the progressing direction is received automatically without complicated tuning operation. |
