In Aarhus, the city government wanted to encourage biking, and they found that, second only to poor bike lanes, cyclists weren’t biking because they didn’t want to be stopping all the time. Planners wanted to find a way to give cyclists the right of way, to indicate that they were a priority…In a pilot program launched earlier this year in Aarhus, the country’s second largest city, 200 cyclists got radio-frequency identification tags installed in the spokes of their front wheels so that, when they approached a particular intersection, trash can-sized sensors would detect the cyclists and turn the light green.

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