Deregulation without chaos stems from time, if suddenly America or Canada didn't have speed limits, I bet you collision rates would skyrocket immensely. However After time, people would get some sense in them and drive as fast as they can responsibly this could take quite some time though.
Here is a thought, we drive on two lane roads. What stops people from going over to the other lane and crashing head on?
People recognize the value of staying in theri lane and do so.
On an expressway here in Michigan, I know it is not the Autobahn, but it is called I-696. The actual minimum speed is 45 MPH and the Max is 65 MPH. Yet we all joke that this three and some times four lanes or more travels at 69 MPH in the slow lane and 96 MPH (* about 153 kph *) in the fast lane. Note: that people travel much faster as well and they are also traveling real close to each other. Some would call it bumber to bumper traffic at excessive speeds. Which is pakced a lot tighter than when I as on the Autobahn myself. I noticed that most people there traveled 100 kph to 120 kph even in the no speed limit zones.
So we do not have a law against crossing the center line, we do it because it is the smart thing to do. We have laws for speed and lots of people break them and do not think about it yet in areas where there is no regulation the speeds are slower.
Peace
Just as if we were to remove the drinking limit or move it to near 12 or 13 like it is in some European countries (Denmark doesn't have a limit but they think 13 is when they can be introduced to alcohol). I think we'd have little drunk children everywhere for awhile and then once it's not so Taboo it would stop being an issue (which I'm assuming would take many years of having drunk children unless parents intervene because they disagree with the law).