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During rainstorm, it’s a high possibility of water disasters. Sometimes it’s hard for people to identify how deep the water is, especially in dark. Many cars anchor in the water. Some even are submerged by the rain, which lead to asphyxia of the passengers and driver since the car’s doors fail to open under the pressure of the water. To prevent those problems, some warning lamps are installed on the surface of the road. Only when the depth of water reaches a dangerous number, the lamps will be light. So the driver can realize the full extent of the water disasters and change their way at once. As you see in the picture, the system is an incom