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This design is the extension of the bicycle traffic system,In the future, the bicycle will become a way of life, people can bring the bike into the supermarket and office. However, after the outdoor riding, the wheels of a bicycle will become dirty. If the bike into the room,it will make indoor sanitation situation is very poor.This design allows people to wheeled the bike indoors after a simple operation,and keep the floor clean,in the outdoors, it is a bicycle mudguard.