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I live in Houston and never knew how it worked. I assumed they only used the toll tags. It's actually not wifi, but rather bluetooth: http://traffic.houstontranstar.org/bluetooth/transtar_blueto.... I am not sure if the bluetooth radio on the phones uses a different MAC than the wifi radio.

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The bluetooth address is actually just one character different from the phone's MAC address -- although this might just be an iPhone standard. Need to check up on Android standards and if it differs by manufacturer.

What makes WiFi (currently) more relevant is more people leave it on. Likely to even out over time as more bluetooth devices are made commonplace.

There is no guarantee that the BT MAC address is related to the WiFi MAC address for a given device. These addresses may be assigned by the product (phone) manufacturer, they may also be assigned by who makes the BT or WiFi module.

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