But really, if you can't use a cell phone, then why are you allowed to have a radio, cigarettes, navigation systems, small children, pets, etc in your car? Are two-way radios allowed? They are all distractions.
Other than children and pets...which are impossible to completely control and even harder to legislate against...there really should be a nationwide agreement with car and car parts makers about things like navigation systems, "car theater systems", cell phones and radios. IMHO, navigation systems should be in "watch and listen" only mode unless the car is in park...you should basically have an idea where you are going once you get in the car...if you change your mind and want pizza instead of Chinese, pull over and reprogram the thing. Car theaters should be mounted on the back of the driver's seat and the audio only accessible through a headphone jack, I think every car needs to come with a built in "hands-free" system for cell phones or that prior to registration car owners must prove they own one (and of course it would help if the system could detect an argument or gossip and disconnect the call so that the driver didn't become distracted. There should be a limit to the maximum radio volume that car stereos can produce...it should also be against the law for advertisers on the radio to use sirens, car horns, sounds of engine trouble or tires screeching. As for cigarettes, since I have yet to meet a smoker that doesn't think the road is his ashtray, maybe a tax of $5 per pack. I know eating and putting on makeup are distractions too, but other than educating people not to do them or at least to know their limits (one hand with the burger and the other has the drink...who's driving...come on)...of course if cars could be designed to detect when they have gone through a drive-thru and only go say 25 mph for, say, 20 minutes after the fact...that would be cool too.