Are some of you guys making some of this up? I can't see how you can possibly mistake being in a car with being on your bike, they feel so different. When I'm driving a car, I feel awkward and more aware of what I'm doing because it is an unusual situation that I'm in, I don't relax and behave like a bike. That's not to say I'm relaxed on my bike, I'm definitely vigilant/aware, but I'm even more vigilant/aware/stressed in a car. I make my girlfriend drive a lot more now.