On Queen St on sunday, big range rover accelrating in excess of 40 mph to get through lights in 20mph zone. But obviously 20mph is NOT the speed limit if you need to get through the lights?
I imagine with speed cameras they just have to go off with a flash a few times a day to get the word out they are in operation and this would slow the traffic right down. See also vigilantes in Lincolnshire with their own speed guns.
The default that drivers should be able to do what they like often appears strong but it is easily countered by stuff that just looks like enofrcement, never mind ACTUAL enforcement.
THe other factor to bear in mind in terms of Pavlovian conditioning, is that the strongest way of achieving a desired behaviour in rats/drivers is to intermittently reinforce the schedule. So even occasional enforcement in a random way would work and indeed if we are all driver/rats it would work better than constant enforcement.
Also it Just takes one driver to stick to 20mph and the rest are stuck behind them. We should hire people to drive around Edinburgh at the speed limit.