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Why a bus station is so chaotic at rush hours ，one reason is that people dont know where the next bus will stop when waiting,so they cant queue up orderly.STOP THERE is a small infrared projector which is installed at the top of front window of a bus.An inside microcomputer can analysis the time of braking and calculate where the front door will be when the bus stops,then it will project a arrow at that place.In this way,people can know where the bus will stop and queue up orderly beforehand.