After many many years of driving I cannot think of one occasion where I've needed to make a call that's been so urgent that it couldn't wait. Ok so times have changed somewhat, with hands free you can however keep your eye on the road, and both hands on the wheel so its debatable to weather its a distraction, the biggest problem are folk who are obsessed with texting. Every day I drive and especially at traffic lights you can see them doing it, and still trying even when the lights change to green, they are complete idiots. The funny thing about it is they think you can't see them, with their heads looking down, and no hands on the wheel, and their upper arms going ten to the dozen :)