Highway in Calgary uses Bluetooth from cellphones to track the speed of traffic [#location]

This Highway Tracks Random Bluetooth Signals To Estimate Travel Times
"The city of Calgary, Alberta has recently installed a $400,000 traffic monitoring system on a stretch of highway known as the Deerfoot Trail. And to track the movement and progress of vehicles it monitors the Bluetooth signals coming from mobile phones, headsets, or built-in entertainment systems. Fifteen sensors in total, spaced out along the route, keep track of various Bluetooth device’s MAC addresses so they know how long it takes vehicles to travel certain distances. And using special algorithms Bluetooth signals from pedestrians or other stray sources are ignored, allowing the system to calculate a fairly accurate real-time estimate of drive times which are displayed to drivers via signage."
via Gizmodo

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