Is it one-handed driving? Would you like to ban driving with your arm out the window? Deny licences to amputees or folks with a broken arm? Criminalize radio station and CD changes while the vehicle is moving?
Could it be talking while driving makes you feel unsafe? Perhaps the state should protect you by mandating silence while in the car, yes? A noise-free zone, much like a smoke-free zone? You could say it's for the children, you know.
Maybe you're just against people not paying attention to the task at hand. Ban scenic drives! Ban looking at your passenger! Ban eating! Ban drinking! Ban smoking! Heck, you're on a public road, right? Why can't the state mandate EVERYTHING you do while operating your vehicle everywhere but in your own driveway!
You can still drive and talk on a cell phone (heck, Batman did it). Just like you can drive with one hand and while chatting with your passenger. What is needed is common sense. Good luck forcing people under pain of law to do that, though.
What about that don't you understand?