Show almost anyone in the world a red, yellow and green light , and they’ll instantly associate the colorful trio with a traffic signal. But add another color to the mix, and many will be left in the dark—or, let’s be honest, totally and completely confused—about what it’s supposed to mean. That’s exactly what’s happening in some parts of the United States: Drivers have spotted the addition of a bright blue light mounted near traffic signals. Yes, blue. But what is its purpose, and does it change how you should approach the intersection? Because remember: Just because you don’t know a traffic rule, it doesn’t mean you can’t get a ticket for it! To get us all up to speed on this new rule of the road , Reader’s Digest spoke with David A. Noyce, executive associate dean of the College of Engineering and the Arthur F. Hawnn Professor of Transportation Engineering at the University of Wisconsin–Madison. Read on to find ...
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