Stuck in the right lane

DRIVING home from teaching at Sorell, back into Hobart about 5pm, bottleneck at the airport roundabout, and there I found an East Coast rental car in the right-hand lane from the airport travelling into Hobart doing 80km/h in the 110 zone, nothing in sight behind or in front and he did not move to the left lane, and seemed completely oblivious to me behind him. Please rental car agencies, educate your clients. Tell them we stay left unless overtaking, isn’t that our law? I have travelled and driven extensively in Europe and Asia, and I think it is universal, cars are obliged to travel left in the slow lane unless overtaking. His behaviour was inconsiderate, dangerous and potentially unsafe because he was very slow and I was stuck behind him while others overtook me on the left until I could also overtake him on the left and he stayed in the right lane in his little car. I think this is dangerous behaviour. Barb Gilbert Lauderdale