Quite a common sight round here in the Fens:- cars stuck behind vans stuck behind lorries stuck behind FastTracs stuck behind foreign lorries stuck behind Arthur and Ethel out for a 30mph jaunt in the countryside. Each wants to overtake the one in front, they all know they can do it but know they really shouldn't but they still try and take an age to do so. The unwritten rule is to floor it, pull out and start to overtake, avoid eye contact with the one you're passing and pray to the gods that they'll let you in before you meet the queue of traffic coming towards you doing the same.