I hate people talking on cellphone as much as the next guy. I actually think cellphone is the root of all things that are evil. But banning the use of them in a car is a little excessive.
People blow each other up everyday with guns but you don't see that being ban.
Well, if this law pass, in the near future when you get pull over you'll need to surrender your cellphone to the officer. Just a couple minutes with your cellphone, god know what kind of information they can optain (like your precious CR password). Do you really want to do that?