Hiya BT it is possable to drive around Australia but there are no sealed roads that cover the whole perimeter of AustraliaI have seen alot of Australia and lived in afew different places, I know as a fact that the sealed roads end at Cooktown in north queensland (the pointy bit on the east coast) Cooktown is several hundred klm from the cape.
The only sealed road goes from Townsville to Mt isa and across to Darwin, then you have to head south b4 getting to a road that goes to Broome (not sure if it is sealed yet) then you follow the coast south to Perth(mostly sealed) then you head across the nullabor plain to Adelaide, then you drive following the coast to Melbourne (some of the best driveing roads along the great ocean road) then you follow the princess highway around the coast to Sydney and follow the road north to Brisbane and then follow the Bruce highway north to Cooktown.
I know that the road from cooktown to Townsville is sealed and the road from Townsville to Darwin is sealed and also i know that the road from Perth to Cooktown is sealed along the coast road heading via Adelaide, Melbourne, Sydney, Brisbane, Townsville.
Sorry about this letter being so long , just wanted to let you know.
I now live in a town called Alice springs, which is allmost in the centre of Australia, 1500kl south from Darwin and 1500 north of Adelaide.
The highways in the Nortern Territory have open speed limits
Alice springs is in the Northern Territory