Protecting me from the stupid
Surely the best way to protect me from stupid drivers is for the phone-jamming tech to be working OUTSIDE my car. Let's say it wipes out everything within a 100m radius - that's giving me a lot of protection.
It's not just loony car drives I'd be protected from. Absent-minded teenagers about to step out into the road in front of me without looking because they're discussing COD Black Ops with their mate would be a thing of the past. And Al Quaeda terrorists wouldn't be able to remotely detonate roadside bombs while I'm driving past.