Have you ever talked to someone while they were driving? Has the conversation ever been interrupted because they needed the other hand to activate the turn signal or something?
I usually drive with my left hand; accessing the signals/hibeams isn't a problem. Hell even when I drive with my right, I am able to slide my hand over to the left side of the wheel to do signals, etc.
There has been one occassion when I've told the person to hold on a second and dropped the phone in my lap ("hang on!" <drop>) to avoid hitting a labrador retriever. Most cases, however I perch the phone on my shoulder (you know how to do it) and use both hands.
As I said, not everyone's a jackass and it does take a bit of mental work to get it into your head that driving is more important than the conversation at hand (seems ironic but it's true) but once you've got your priorities straight, it's as natural as talking to someone beside you.
I find it hard to believe that when I've talked to people who are driving, they've never once been in a situation where it would be safer to use two hands.
There are definately situations where it is better to drive with both hands. The one I can think of off the bat is rough roads. I can swerve better one handed, I can get myself out of slides better one-handed. I dunno; maybe I'm just weird that way.
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