Many drivers just do not realise they are driving too close. I had experience of this a while ago, when after having a builders 1 ton pickup following me for a few miles, in a 30 limit, where I was doing an indicated 35, we had to stop at road work lights, so I took the opportunity to hop out and, politely, ask him why he was driving so close, he answered "was I, I didn't notice?". What can you do with people like that?
