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In our daily life, necessary conspicuous warning is often lacking when the drainage system is under repairation, which brings potential safety danger to the traffic. This design combines the function of a roadblock with that of a well lid. The expansible roadblock pole can be pulled up as a warning and give people clear indication of obstacle ahead when the drainage system is under temporary repairation. Besides, a cascade of all-linked-together pattern in the center increases the leakage gaps of the well lid, thus providing a larger space for draining.
Kun Huang Cheng Cheng Mengdie Huang Guang Li