Just came back from Germany and drove on the no speed limit part of the autobahn. It was orderly and I felt perfectly safe with family going equivalent of 120mph. No one cutting you off, unless passing, no sitting in left lane. Getting passed at that speed like you are standing still takes a bit getting used to, but again, it’s very predictable. Did not witness any accidents in 2 weeks of driving. It can be done, just need proper rules, penalties for breaking them that are actually enforced and of course good roads (didn’t see any pot holes either).