One of my biggest concerns is when police officers are talking on their cell phones! Goodness sakes, they feel superior because they go through driving schools to handle high speed and all that...
I think many ppl can handle the idea of talking on the cell phone and mindless driving, especially if it's a path they drive frequently. My concern is when the other driver can't handle it, or when you get a flat tire, or something falls off the truck in front of you. Those extra seconds mean a great deal at that time. And though I guess most of us don't drive with two hands on the steering wheel, if one has a phone in it, you tend to hang onto it instead of dropping it....
But underneath it all... I wish that Western society could slow down enough to not feel like they have to cram their telephone calls into drive time!