Question Author
exactly my point!
so why do people think it is necessary to slow down so much?
i will confidently pass a motorway camera at an indicated 75, because in reality i am more likely to be doing a real 68mph, and at that speed, not a court in the land can touch me.
best way to work it out is to pass a static speed warning sign, not just one that flashes the speed limit, but one that tells you your speed. its surprising how far out your speedo will be, and also makes you have less sympathy for people who bitch on about getting a NIP at 34mph. the speedo will have been reading nearly 40, so you deserve it!