Tracking phones for traffic reports - Technology - International Herald Tribune:
Matt Richtel
"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. The technology highlights how readily cellphones can become tracking devices for companies or government agencies - a development that troubles privacy advocates. 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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