why do police cars have blue lights

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The police in our town have cars with all kinds of colors of flashing lights on them -- they have white, red, and yellow lights. Their main purpose is to get your attention and to get you to realize that they are police and not some other people with flashing lights. Non-police cars and trucks usually have yellow flashing lights to warn you that they may be moving slowly or may be making frequent stops.


Examples include tow trucks and street sweepers. You want to be able to distinguish these from police and fire vehicles, even late at night when all you can see is their lights, so that you know when to pull over when they come zooming by. Blue isn't the greatest color for visual perception, as we answer elsewhere in this archive, but it works fine for the purpose. (published on 10/22/2007)

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why do police cars have blue lights