I've been wondering for many years before the first traffic camera appeared, why the toll-roads aren't enforcing the speed limits automatically. The time you enter and exit the highway is recorded down to a second. The distance between these two points is known — your average speed could be computed on the spot even with the early 90-ies technology...
The polite police officers would be standing right behind the toll-booths issuing tickets without the drama of hiding in the bushes, then chasing you at highway speeds...
And, yeah, you could lower it by stopping at a rest area — but it'd still be a tremendous disincentive to speed.
I was and continue to hope, that such universal enforcement, affecting all voters, would cause the limits to go up to reasonable figures — or even be abolished completely...
I've run into these people, they're the worst
When have you last checked your compiler's output?
There's no overarching EU law. There are EU regulations and directives, and the member states (who each have their own state laws) must fold those directives into their own state laws in a way that fits. The regulations tend to be very targeted.
So in a manner of speaking, it's all state laws, no "federal" law, just local interpretations of "federal" directives and some common standards. And contracts in each state have to follow state law. If someone objects that a "federal" directive is broken, then they can sue the state in an EU court, etc.
A big difference with America is that a legal precedent in one state doesn't mean anything in another state. It often doesn't mean anything in the same state either. The judges interpret the legal texts, but do not create new case law. You can't refer back to some judge such-and-such who said something was ok in a similar lawsuit, so therefore it must be ok going forward in all future lawsuits.
"What the scientists have in their briefcases is terrifying." -- Nikita Khrushchev