| 摘要 |
PROBLEM TO BE SOLVED: To give an alarm in the position in which an alarm is necessary for passing by providing a means which can transmit an alarm signal automatically when it is determine that a detected movable body position is an alarm required position previously set on a map. SOLUTION: An alarm switch 5 is arranged in a transmission unit, and when the alarm switch 5 is pressed, an alarm signal can be transmitted optionally. A receiving unit II is constructed of a receiving apparatus 7 receiving an alarm signal via an antenna or a wave receiving apparatus 6, a buzzer 9 generating alarm sound, and driver 8 driving the buzzer 9 on the basis of a receiving output from the receiving apparatus 7. In this case, an alarm signal is automatically transmitted when a vehicle starts to enter a crossroads inlet in a crossing requiring an alarm. Then, this transmission signal is received by another vehicle, and a buzzer 9 arranged in the vehicle starts to ring so as to inform a danger prediction to a driver on the vehicle. |
