Your figures are just about reducing SPEED, which cameras obviously do. My argument, based on the DfT's own figures, is that the problem lies in areas other than speed, which cameras are incapable of dealing with. On the subject of SafeSpeed.org, here's an article referring to the owner of that website you dismissed as 'for petrolheads' by the editor of the Observer, the last publication you'd expect to be endorsing such a site: http://observer.guardian.co.uk/leaders/story/0,6903,1530242,00.html The second paragraph is very relevent. I find it incredible that the DfT tells road users to Think!, yet you're proposing a device which encourages us to do exactly the opposite.