Researchers in the Civil Engineering department at Purdue University have devised a way to pick up the identifying addresses from Bluetooth devices in consumer electronics. Because each device has its own distinct digital signature, its travel time can be tracked by detectors installed at intersections or along highways and other locations.
One faculty member says "Now we have a way to measure how slow traffic is on a given stretch of road or how long it's taking people to get through airport security at a given concourse and time of day."
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