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

The ABC15 Investigators found most large Arizona cities time their yellow lights shorter than the national traffic engineering standard, even as our state has the worst death rate for red-light ...

Any driver should know that red traffic lights mean “stop” and green lights mean “go,” but whether yellow lights mean “slow down” or “go faster” may be up for debate. Yellow lights, the temporary ...