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White and silver cars are the safest to drive on the road. White is the most visible during the day and night and its contrast to the color of the road adds to its visibility, while silver is a color that doesn't appear much in nature. Continue Reading.
Some departments have many different colored cars because they picked whatever was cheapest from the dealership. The light colors are dependent on the various statutes in each State. In Illinois, for instance, police cars usually have red, blue, and white lights, except in Chicago, where police only use blue lights.