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This is designed to make it quicker and easier for drivers to find a parking space in a parking lot. Each parking space is adhered with a light emitting device. When a parking space is empty, the ground over there will be a green light beam, making it easy for drivers from a distance to locate a parking space. When the car is parked, the light emitting device will automatically go out. Such an intelligent design is simple and cheap, but is bound to bring convenience to drivers.