I would argue that the car you can drive is related to the level of licence that you hold, not to the road rules.Every driver - L, P, full licence - is required to drive within the speed limits. That's the effect of the road rules. In Victoria (among others), only P-platers are banned from driving "high performance vehicles"; even Ls can drive a Skyline or other high performance vehicle. So, if WA doesn't have a power restriction like Vic has, then a driver with a WA licence, even if P-plater, can drive a "high performance vehicle" in states where the locals are restricted.