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| Cars pass over traffic detectors on a roadway in Columbus, Ohio. Each square outline cut into the pavement marks the spot where road crews have inserted a loop of wire. The wires act as metal detectors, allowing city engineers to monitor traffic flow. An Ohio State University engineer has developed software that detects traffic jams faster than previously possible, using data from the in-road detectors. Photo by Benjamin Coifman, courtesy of Ohio State University. |
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