White traffic light suggested for self-driving cars

Red, yellow, green, and white traffic lights? That's what is being suggested by researchers at North Carolina State University when it comes to traffic signals as self-driving cars become more and more of a reality. In a press release revealing a study, the white lights "would enable autonomous vehicles to help control traffic flow – and let human drivers know what’s going on. “The white phase concept also incorporates a new traffic signal, so that human drivers know what they are supposed to do. However, the study also shows, as the percentage of autonomous vehicles at white phase intersections increased, the benefits of their purpose did too.