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HoloG is new safety equipment for the level crossing. By using the hologram technology, those conventional multiple and complex signs are replaced by a big visible hologram projection. With this visible projection, drivers can see the train information more easily that immediately catches their attention. HoloG system has four detecting lines. Each detecting line actually is a projection projected by dozens of hologram transmitters and receivers. Those sensors will detect an emergency while a car gets stuck on the tracks. It will immediately send the SOS signal to the coming train, and then the train guard can stop the train in no time at all.