Wardriving at the toll plaza?

hctra-logoThe EZTag system used on the Houston tollways is a WiFi device that transmits your personal account information constantly and is received at the toll plazas every time you whiz past. Your EZTag account is then charged the toll automatically and you don’t have to stop or slow down. This has me wondering if anyone has used their Pocket PC to determine what information is transmitted to the toll plaza? Not that I would advocate hacking it but curious from a technical standpoint.

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