It has little to do with attitute, it is all about temper.

I was once the person that could not stand some one in front of me driving just below the speed limit. It drove me crazy. Now, with my little one, I became the one keeping exact the speed limit.. driving someone behind me crazy...:))

On the other hand, I think some one who drives exactly the speed limit in a one lane road, ignoring the long queue of car behind, needs a strong nerves and a really positive mental nature.