Traffic 21, a multidisciplinary research initiative at Carnegie Mellon University, applies some of the latest research and technological advances coming out of the university to real transportation issues in the region.

On the streets of East Liberty and Bloomfield, Traffic 21’s adaptive traffic signals change color depending on current traffic volume. The project began in 2012 with nine intersections in East Liberty and has expanded to 49 intersections, reaching into Bloomfield. “One of the most efficient ways of reducing congestion is having optimal timing of your traffic signals,” said Caldwell. “We’ve had reductions of wait time of up to 40 percent, so these signals have been very significant there.”

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