If you’ve seen talk about a white traffic light or images of a signal with an unfamiliar fourth color, you’re not imagining it. With everything drivers already pay attention to at intersections, ...

New research shows that AI in cars might warrant a new, four-light traffic signal that is more efficient. Getty Images/iStockphoto Surely this will complicate the game of red light, green light.

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Traffic lights are the worst—not only do they put stops in your ...