* 7. A device that automatically disables any cell phone in any car within 50 car lengths of me and heading in my direction.* Pretty sure this would have the o

* 7. A device that automatically disables any cell phone in any car within 50 car lengths of me and heading in my direction.* Pretty sure this would have the opposite of your desired effect. Nothing will distract people more and have them fumbling around with their phone than if a call drops, GPS loses signal, streaming radio stops, etc. Obviously, people shouldn't be doing these things in cars, but I think it's always interesting to think about unintended consequences. Also, I'm pretty sure your (7) was in jest, anyway, but just playing along here...