I have grave misgivings about on-the-spot-fines, as they turn the police into witness, prosecutor and judge rolled into one. A minority of police are over-zealous, target-driven or just wish to impress their superiors and there is little chance of a wrongly accused motorist getting justice. In particular, with middle lane hogging it is a question of judgement how long it is reasonable to stay in lane two in preparation for passing a lorry, let alone how long is worthy of a £100 fine. With a busy motorway it is all too easy to get trapped in lane one at 57mph, and that must be one reason for some of the apparent hogging.