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)
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