road laws are funny... with normal laws, you must follow the laws of the jurisdiction that you are in at the present time. with road laws, you must follow the rules of the jurisdiction you are licenced under. so therefore, in NSW, you travel at the speed limit, not at 90km/h. However in saying that, if your friends do get pulled over, tell them to be nice and friendly to the police officer, and explain the situation. Don't just flash your licence and say 'deal with it buddy im not from here' cos they can still book you for something!!!!!