| 摘要 |
There is a central sever (1) equipped with data transfer means into reception units and diffusion (3) on vehicles. The units comprise vehicle positioning means (2a), which are selectively diffused. There are localization means (25) and message diffusion means (31). The messages are stored in accordance with data positioning. The message memory is updated and the diffusion is controlled by instructions, which are also stored and updated. Messages are diffused in a vocal or written form. There is a transmitter (32), which communicates the units' position to the server.
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