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What are the blue lights under the traffic signals?
The purpose of the blue LED lights on the traffic signal mast arms is to aid law enforcement officers in catching red-light runners. The blue light comes on when that traffic signal turns red. If an officer is sitting at a traffic signal in an opposing direction, and notices a driver enter the intersection while that blue light is on, he knows that the driver has run the red light.

The lights have been there quite some time, but they were white. Recently, FDOT changed the color to blue to be more visible.

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