Seriously. You're operating a motor vehicle. Hang up. Drive.
"But I'm Hands-Free!"
That's not a valid excuse, dummy! Your attention is still not on the road. Studies have shown that your reaction time is worse than an 80-year-old who has had 3 drinks.
As much as I'd love to see you Darwinized, you're putting other peoples' lives at risk too.
And don't call me if you're on the road!
Oh yeah. When you call me and I'm driving and I'm rushing you off the phone it's BECAUSE I'M DRIVING! Let me off the damn phone!