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This warning lights, installed on both sides of the door. When the door is closed, it is warning as usual with yellow light. When the bus stops, the door is open, it will cast a two red ray in the door extending outward. Guiding the passenger's consciousness in queuing. if they are not in accordance with the guide lines, or still stepping on the line, there will be a kind of remorse psychologically.It Will gradually develope passenger's queuing consciousness, and also avoids the problems of crowdness when getting on the bus.