Urban mobility problems demand clarity. Intersections remain the most common sites for crashes, congestion, and violations.

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, ...

Roundabouts are generally associated with a greater number of vehicle crashes when compared to traditional stop- and signal-controlled intersections. However, the crashes are less severe and there ...

Early traffic lights had only red and green, which unsurprisingly made intersections rather chaotic. Who invented the yellow ...