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When the city is flooding. At certain flooded roads driver don’t know how deep the flood is. Engine will fail when they try to cross the deep flooded road.The pole of new design traffic will detect the depth the flood. When the flood is deep enough to cause cars with certain chassis, height engines failure. The traffic will waring the those certain cars to bypass the flooded area. (Detecting flood depth above 120mm, Waring small vehicle to bypass.Detecting flood depth above 200mm, Waring large vehicle to bypass)