John Shaw, Wisconsin DOT, 2013 Federal Highway Administration, 2013.

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Presentation transcript:

John Shaw, Wisconsin DOT, 2013

Federal Highway Administration, 2013

Non-Significant Address Part (NAP)Upper Address Part (UAP)Lower Address Part (LAP) 00:00094E:22:19 Manufacturer-assigned, irrelevantCan be derived from trafficSent in every packet

University of Washington STAR Lab

Washington State Transportation Center, 2011

University of Washington STAR Lab

 Remember this slide? LAP does not permit manufacturer identification; UAP is captured  Not globally unique? 1 in 24,048,576 is pretty unique in most metro areas. Have two or more devices in your car?

Edward Snowden by way of the Washington Post

Areas on Seattle area highways showing recurrent inquiry activity Transmissions from 9E:8B:33:16 Locations match expected spots for route choice tracking, also DoT traffic cameras. Notably absent: SR520 bridge, home of known Bluetooth speed sensors.

Multiple areas where an address was found for ~700M Approximates the area covered by a Class 1 Bluetooth transceiver Locations were a subset of inquiry scan locations! Notably absent: SR520 bridge, home of known Bluetooth speed sensors