Red, yellow, green ... and white? Smarter vehicles could mean big changes for the traffic light

This undated photo provided by the University of Michigan College of Engineering shows vehicles as they drive through the Old Woodward Avenue and East Maple signalized intersection, which was retimed using the Optimized Signal as a Service (OSaaS), in Birmingham, Mich. Smarter vehicles could mean some of the most dramatic changes for the traditional traffic signal since the yellow light was added more than a century ago. (Jeremy Little/University of Michigan College of Engineering via AP)

This undated photo provided by University of Michigan College of Engineering shows Dr. Xingmin Wang, postdoctoral research fellow at the University of Michigan-Ann Arbor, showing off a visualization of connected vehicle trajectory data insights which aid in the optimization of traffic signals. Smarter vehicles could mean some of the most dramatic changes for the traditional traffic signal since the yellow light was added more than a century ago. (Jeremy Little/University of Michigan College of Engineering via AP)

This undated photo provided by the University of Michigan College of Engineering shows Jim Lollar, Mcity test facility manager, as he works inside of a traffic control cabinet at the Mcity Test Facility, identical to ones found at signalized intersections across the country. Smarter vehicles could mean some of the most dramatic changes for the traditional traffic signal since the yellow light was added more than a century ago. (Jeremy Little/University of Michigan College of Engineering via AP)

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