Yep, and it's a major problem down here. Any time my boyfriend and I comment on someone's poor driving we both pass the car and glance in and then say "oh he/she is on his/her cellphone"
I completely disagree with the teen cellphone ban, because it isn't fair and it isn't only teens. In fact, around here I see about 90% of the drivers driving irratically on their cellphones are middle aged. So they should definitely ban it for all drivers. I never use my cellphone in the car, and I set it up for bluetooth so it just connects automatically when I enter the car, but I hardly ever use that.