| 摘要 |
PROBLEM TO BE SOLVED: To improve warning reliability by fitting a warning control part which makes a warning device produce a warning output only when a warning condition discriminating means discriminates that it is a combination for warn ing. SOLUTION: When a radio receiver 2 receives a wave, counterpart vehicle data are distinguished with a code signal by a DTMF discriminating circuit 13 and a CPU 11 discriminates whether it is a combination for warning or not in the combination of the counterpart vehicle data obtained from the DTMF discriminating circuit 13 with a self-vehicle data obtained from a self-vehicle data setting part 9, based on the combination condition set at a warning signal condition setting part 10. If it is a combination for warning, an annunciating command is outputted to a warning device control part 14. Only when a counterpart vehicle is a vehicle which needs warning, an acoustic warning device 15 annunciates at both of a business vehicle traveling on an A-zone upward route and a maintenance vehicle traveling on the A-zone upward route, provided that the business vehicle and the maintenance vehicle approach each other. |
