I should point out that the computerised car thing was a throw away comment. It was not intended to be taken seriously.
Sciby, I do agree with most of the points you make but we can't change human nature. Power restrictions work for bike riders and probably would for cars too but I know many a bike rider who has ignored these rules and driven more powerful bikes before it was legal for them to do so. The same thing would happen with cars too... if someone really wants to break the law they will.
The point I am trying (i hope) to make is that for the average person new rules would work but to if someone wants to do something stupid like 200km on L's then they will find a way to do so. This girl obviously doesn't give a stuff about the existing rules and I doubt she would have any different attitude towards any new road rules.
Onto NSW road rules... I don't know about P platers now as the system has changed since I was on my P's but I never had any drama's with an 80km speed limit but then again there weren't many roads around my home that were more than 80km. I can't see it stopping anyone from wanting to drive as 80km in a car is better than a bus, train or foot power. I never bothered to take my P plates off as you would just loose more points and $ if you got caught speeding and not displaying your plates.