In traffic-industry parlance, a green ball is the standard green light on a traffic signal as opposed to, say, a green arrow.

A thin film that reflects light in intriguing ways could be used to make road signs that shine brightly and change color at night, according to a study that will be published on Aug. 9 in Science ...

Colorado State Patrol troopers say ignoring traffic control signs is leading to more crashes across Colorado. Troopers say they issued 794 citations to drivers disregarding or failing to obey ...

Several of the signs were concentrated along 28th Street, a busy north-south thoroughfare that the city has identified as being particularly dangerous.