| 摘要 |
PROBLEM TO BE SOLVED: To enable a driver to exactly grasp a situation around a vehicle.SOLUTION: Radio equipment is held by a person or an animal. A transmitting part transmits a presence signal for making persons around recognize the presence of the person or the animal by designated transmission power. A receiving part receives a search signal for searching for the radio equipment held by the person or the animal from radio equipment mounted on a vehicle. A transmission power control part 245 lowers the transmission power of the presence signal when receiving the search signal. For example, the transmission power of the presence signal may be lowered to power for generating a transmission radio wave of a transmission distance corresponding to a safety distance between the vehicle and the person or the animal. |
