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Answered 2005-03-16 00:09:03

Many newer cars have automatic windshield wipers. These work with a rain sensor, usually mounted near the rear view mirror. The sensor uses infrared light to sense moisture- droplets scatter light, and the when enough light is scattered, the sensor decides that it's raining. It then signals for the wipers to come on. Dirt can also fool the sensor into turning the wipers on.

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