What is significance of the red and green light on the outside of a firehouse?

What is significance of the red and green light on the outside of a firehouse?
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answer:Just telephone the firehouse or stop by and ask the guys who work there. They will be happy to give to a complete explanation. They might even invite you in for lunch, and if so, you will have the best food you have ever eaten, anywhere. August 24, 2008, 12:48 PM EDT
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