This article is from the soc.culture.australian FAQ, by Stephen Wales with numerous contributions by others.
Roads are O.K. around here - but I live in Sydney :- I don't know
about the roads up north because I have never been there..
I've never heard of roads being overflowed, unless you mean
flooded (with water). This has happened over the last couple of
summers in the northern tropics, but roads are generally only cut
for a few days. If you want to travel north, it is usually best
to do that May to November when it is dry and travel south
September to April. [FS]
The monsoon hits the far north of australia, so the roads may be
flooded and only usable by boats. however this only is a problem
north of Townsville in Queensland and around Darwin in the
Northern Territory the rest of the country is in summer HOT and
dry for the most part but its is much colder in the southern
parts and you may have some rain down there... IT IS A BIG PLACE
and spans a large part of the earth!! [FW]
The term 'condition' usually implies whether they are good for
driving on or not. The term 'streets' usually means the roads in
the cities. The term 'roads' usually refers to the highways,
etc. So, to answer your question: they are generally in a good
condition to drive on (the government has spent a lot of money
lately fixing up the roads). I'm not sure where you mean exactly
when you say 'north' since there is a lot to the north half of
Australia (covering three states and many thousands of
kilometres). If you mean Queensland (North East) then the roads
are usually busy with holiday travellers. If you mean Northern
Territory (North Central of Australia) then the roads are usually
busy before Christmas (although there are still a number of
people about on the roads). If you mean in Western Australia
(North West) then you will find a lot of outback, very few
people, few roads, and few cars. I think you mean Northern
Territory ? [IC]
No worries. Stay on the highways and you'll have no problems. It
often rains a bit, but it is rare these days to have major
holdups. But don't go off on to unsealed roads. [RC]
 
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