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In recent years, heavy rain frequently brings flooding conditions. The water filled the entire road and ran above the gutter,the pond and the river. It caused pedestrians and the cars could easily fall into the deep water. Light Boundary is a roadway warning device designed for flooding conditions. It is made up of a water battery module, a water level sensor and LEDs. This device was set along the gutter or the brook by Road Department. When the sensor senses the flood level is too high, Light Boundary will project red light on the water surface to form a visible borderline to help people identify safe area and avoid the accidents.