Yes, lane-splitting works in cali and should elsewhere.
Unlimited speed limits work on the autobahn in Germany and should elsewhere.
The difference? Education, yes; mentality, more. I didn't think German driving was much better in Germany when I got there. They weren't, many of the drivers truly are crap. However, the adherence to the rules is better. I didn't appreciate German driving until I returned to the states for a vacation. It was so very bad, much worse than realized when you first get to Germany.
Lane splitting should be legal, but so should much higher speeds. It is practical when people know what is going on. Unfortunately, the US lives to the lowest common denominator and that is why we are declining in world power. I hope we wake up and retake our superiority (as a country) soon.