What is there about driving a car that seems to make a person's personality change for the worse?

I have many friends who drive cars to work, shopping, etc. Some of them are as decent and nice as people could be, some claim to be truly Christians. But when they get behind the wheel of a car they change into mean, profane, aggressive %26quot;maniacs%26quot;, so to speak.
What is there about driving a car that seems to make a person's personality change for the worse?
They feel a lack of power and control in their life, and the car gives them a sense of power and dominance.

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