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When the city is suffered the waterlogging,roads with lower-lying areas are usually full of rain.This water level warning is combined with the tapered roadblock,which is fixed on the both sides of the road.When there is any accumulation of water,which is above the warning level,this water level warning will be divided into two parts,which are connected through the internal retractable steel wire, by the internal water pressure inductor.Not only can it measure and indicate the water level on the screen,but also light up the warning light,which helps the drivers to obtain the timely road information to avoid dangers.