Anonymous Wireless Address Matching (AWAM) detects vehicles equipped with enabled Bluetooth networking devices such as cellular phones, mobile GPS systems, telephone headsets, and in-vehicle navigation systems. Each AWAM reader senses probe devices as they pass a reader station and transmits the time and location of the device to a central host system. As probes are detected at successive AWAM readers, the host system calculates average travel times and speeds for a roadway segment.


Bluetooth is a wireless protocol for networking devices over short distances. Each device using Bluetooth has a unique identifier called a Media Access Control address, or MAC address. Devices able to read these Bluetooth addresses are installed in the AWAM roadside equipment. The software running inside the roadside equipment package then forwards the device addresses to a host software component.

A Note About Privacy

The MAC addresses read by AWAM are not directly associated with a specific user and do not contain any personal data or information that could be used to identify or “track” an individual’s whereabouts. In addition, all addresses collected by AWAM are anonymized through encryption immediately upon receipt. Users who have privacy concerns are also able to turn off the Bluetooth discovery function of their device which prevents it from being read by AWAM at all.