Red means stop, green means go - but what about blue? You may have seen blue lights on top of traffic signals at some junctions; here's what they do.

A small blue light shines on the backside of a traffic signal at the intersection of Broadway and Everett Avenue on Sunday, Dec. 11, 2022, in downtown Everett, Washington.

Unlike the elusive blue stop sign, pink traffic signs are more common than you think. And no, you don’t have to hit up the Happiest Place on Earth to see them, like you do with those purple ...

While “go” signals in Japan are generally green or a shade of blue-green, and the ancient days of identifying colors by just four categories are far behind us, Yamagata says there’s no stop ...

You might have seen traffic lights in Japan that are a little different to what you're used to. Instead of being red, amber, and green, the last light on the signal might be blue, or perhaps an ...