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There is too much rain on road after rain and we can not sure the depth of the water.So I design this surface buoy.According to the buoyancy. It determines the water depth by the inside of the ball tape structure and the ball floats up and down.The tape is with red and green light reflecting material through lens enlarging and refracting to car. When the refraction is green,the depth is shallow meaning safe.While,when it is red which means the water is deep and cars should not pass through.
Chuang Wang Chunlei Shi Bei Wang Qianying Zhao