Method Uses 'Bluetooth' To Track Travel Time For Vehicles, Pedestrians

Engineers have created a method that uses pervasive Bluetooth signals from cell phones and other wireless devices to constantly update how long it takes vehicles and pedestrians to travel from one point to another. The method envisioned by engineers represents a potentially low-cost leap in technology to provide information for everything from the speed of the morning commute to the sluggishness of airport security lines.

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