I'm curious as to why this is such a hard concept for so many to grasp.
If there's a sign saying "no trespassing; trespassers will be prosecuted" at the edge of a property, you may have the right to venture right up to that edge, but you 're not entitled to dance a jig on the line, then complain when you're caught with a foot over it.
At some point, personal responsibility has to come into play. As I said before, the maximum speed is not simultaneously the minimum. You are not forced to drive on the edge of the maximum. That is your choice.
Yes, speedometers can be inaccurate, I get that. But you're still choosing to drive right to the very limit.