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Warning manhole cover is designed to alert people and cars when manhole is opened to avoid accidents such as people falling into it. At the same time, the design can also be a warning sign when workers mend underground pipes in an emergency. When the manhole opened, erect and fix the cover as a warning sign, the light will be automatically turned on, which alert both walkers and cars to be careful and made a detour. This sign is very obvious and will effectively reduce the chance of accidents.
Wang Xiaoliang;Shao Cong;Lin Huan;Qu Xiangyun