A few months back I was watching a tv prog and celebs were discussing things that annoy them. One of the celebs said she gets really annoyed when driving along and sees the cars around and ahead of her leaving what she considers too big a gap. She said something to the effect 'it's a waste of road leaving all that empty space. They should bunch up more, plus they'll get where they're going quicker'.
I don't think she was saying it for comedic effect, it seemed to be a genuine annoyance for her.
With folk like that on the road, is it any wonder tailgating seems to be an ever increasing aspect of driving today.