Couple of years ago, A316 at Twickenham, 40mph limit, loads of cameras. It's early (5.45) morning and I'm wombling along on my way to work, no hurry, doing about 40.
Car comes up in a hurry, 60+ probably, in outside lane. Overtakes me then brakes hard to slow down for the speed camera. Goes past than then floors it back up to 60 or so again, overtaking the police car that is a couple of hundred yards in front of me.
Loads of blue lights and an 'in a hurry are we Sir?' interview starting as I go past.
Shows how easy it is to get into a habit. Also how much attention the driver was paying to the rest of the road conditions round him - deserved to be done for driving without due care and attention if nothing else.