The cynical view, which in this case (or anything political) is also the rational view, but not the one the protagonists see or admit to - to them it all makes perfect sense!
It’s really ‘pythonesque’ when you think about it - we probably have as many sets of road rules as we do states and territories, plus one - the national road rules, allegedly?? on what all others are based - so about 15 sets altogether? Though I imagine there’s not many police or council enforcers in Antarctica - and maybe Jervis Bay is just plod from NSW …