| 摘要 |
PURPOSE:To prevent the collision of communication of cars in a plurality of car tracks, by providing a car number transmitter at each car line, discriminating the track number on the car on which it runs, and detecting a vacant line signal corresponding to the discriminated track number. CONSTITUTION:An inlet section of a communication zone is provided with track number transmitters 11-13 at each car track. The track number of the track is discriminated with a signal from the transmitters 11-13 on a car, a specific vacant track signal is received from a transmitter-receiver 5 on road based on the car track number and the transmission/reception of a message is done with the transceiver 5 on road based on the vacant track signal. The discrimination of the car track number can optically be read on the car for characters, graphs and patterns displayed on a road. |
