@Grease Monkey: I like "IMBY" - you're quite right, people hate speeding cars unless they happen to be driving them. There's something very odd about a car, perhaps the power, that turns normally nice and sensible people into Clarksons (myself included).
@willowtoo: HGVs and PSVs have tachographs, that record the speeds that they're driven at. These heavy vehicles also have slower speed limits on roads than cars do, because they have greater kinetic energy at a given speed, and hence are much more damaging when they crash.
Speed cameras aren't a tax, as you don't have to pay any speeding fines if you don't break the law. If you must think of it as a tax, it's the only optional tax in existence!
Those that find it difficult to drive within the speed limit almost all the time, wouldn't pass the driving test if they had to take it again. If you can't satisfy the requirements of the driving test you shouldn't be allowed a licence to drive.
Lower speeds increase the time a driver has to react to unexpected situations, as well as reducing stopping distances, as well as reducing the impact energy if a collision can't be avoided.
Speed limits are used, even on apparently empty and safe roads, because the whole point of crashes is that they're the result of something completely unexpected happening!
Would those who want to remove speed cameras, also vote for all speed limits to be removed too? Or just make abiding by speed limits optional for self-appointed Good Drivers?