A couple of weeks ago your DT column had a letter from someone who had been caught doing 54mph in a 50mph zone. No doubt his speedo was reading nearer 60mph, so there's no real excuse. My Fox’s would have been reading 58mph. But what has happened to the ‘ten per cent over plus 2mph’ buffer before issuing a speeding ticket? And if 4mph over is sufficient to issue a ticket, why not 3, 2 or even 1mph over?