Why do some police cars have all blue lights and others have red and blue?

Why do some police cars have all blue lights and others have red and blue?
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You’re asking us?!? ;)
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The sky appears blue because – (1) All colours interfere to produce blue (2) In white light, the blue component dominates (3) The atmosphere scatters blue colour more than the others (4) It is actually blue

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The sky appears blue because (1) all colours interfere to produce blue (2) in white light, the blue component dominates (3) the atmosphere scatters blue colour more than the others (4) it is actually blue

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