The same people who feel compelled to get in the left hand lane on the freeway and drive 5 miles under the speed limit. There are those out there that just live to make sure the rest of us "follow the rules." They get off on being the enforcer.
The ones who do it on purpose have to be the absolute worst. But the idiots who do it as a matter of habit are almost as bad. ‘Get on highway...ok. Merge all the way over to the left.... okay. Get on cellphone and slow way the hell down...... check.’.
They get passed on the right by traffic and think nothing of it. But at least they let it pass.
The busybody vowel holes who are doing it on purpose often “pace” the car next to them so they make an impassable wall.
There was some self-righteous AH who wrote a letter to the editor here in NC over the summer, talking about how he took pride in doing this. (I think it was the Jacksonville NC paper)
You should have seen the comments on the webpage and the subsequent letters to the editor. Boy, did they give him a piece of their minds!