'Bluetooth' signals show airport security-line waiting times

Researchers have used Bluetooth signals from cell phones and other wireless devices to track how long it takes travelers to get through security lines at the Indianapolis International Airport.

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<p><a href="http://www.physorg.com/news163693126.html">'Bluetooth' signals show airport security-line waiting times </a></p> <p>Researchers have used Bluetooth signals from cell phones and other wireless devices to track how long it takes travelers to get through security lines at the Indianapolis International Airport. </p>