A traffic engineer tells me, "We had developed something similar to this approach considering no traffic light as opposed to introducing the white light. Our work was published maybe 12 years ago.. Traffic lights have had three colors since the addition of the yellow light in 1923, but with new technology comes a need for new colors. More and more autonomous vehicles (AV) are driving on the roads, and the proposed new light would utilize AV's ability to communicate with nearby AVs and traffic lights to better sustain traffic flow.

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By Catherine A. Cardno, Ph.D. Transportation engineers at North Carolina State University in Raleigh have proposed a fourth light on traffic signals. This light would better streamline traffic at intersections, as human-driven cars increasingly need to interact with self-driving, autonomous vehicles. "Autonomous vehicles are arriving, and.. Adding a fourth light to traffic signals—in addition to red, green, and yellow—would shorten wait times at street corners for pedestrians, a new study shows. It would also improve traffic flow.