How do cities keep track of the traffic flow?



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    Several state transportation agencies, including those in Maryland and Virginia, are beginning to test technology that allows them to monitor traffic by tracking cellphone signals and mapping them against road grids. These new traffic systems can monitor several hundred thousand cellphones at once. The phones need only be turned on, not in use. And sophisticated software now makes it possible to discern whether a signal is coming from, say, a moving car or a pedestrian.

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