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Blue stop signs are not issued by the U.S. Department of Transportation. Instead, they're often used on private property, especially in Hawaii.

Here’s how they work and what are they used for: • Signal activation. The blue lights are wired into the traffic signal system and turn on when the traffic light changes to red.

These blue-and-white traffic signs are even accompanied by an 'express lane' on the nearside lane of the dual carriageway, separated from the offside lane by a solid white line.