Regarding cell phone usage in cars:
Have you noticed the people who hold their phone to an ear with the opposite ear? For example, they hold the phone to their right ear with their left hand, so that they are steering with their right and the left is crossed over their body.
I do talk on the phone in the car, 90% of the time using a hands-free device. I still ask people to hold when in a tight situation or when leaving a parking space. Some people just don't know when to say, "Hold on a sec."