The latest gizmo in the US car market is the GSM/WiFi bridge, which effectively creates a private local area network inside the vehicle, with the data flowing across 2.75G cellular channels.
I should point out that US cellular providers can offer mobile data at speeds of around 150 to 200,000 Kilobits per second on a widespread basis.
Anyway, enough of the technology. Apparently there is some discussion about whether Avis should offer liability insurance in case someone hacks into the car-based WiFi network and stages a spam or denial of service attack.
Only in America. Only in America...