I share the following links, on how to find road closures, for the state/area you are travelling through, you will have to zoom into some of them

Australian Capital Territory (You have to scroll down, and then zoom in, for this one)
https://www.cityservices.act.gov.au/roads-and-paths/act_public_road_closures

New South Wales
https://www.livetraffic.com/desktop.html

Northern Territory
https://roadreport.nt.gov.au/road-map

Queensland
https://qldtraffic.qld.gov.au/

South Australia (You will have to zoom out on this one)
https://traffic.sa.gov.au/#mapo

Victoria
https://traffic.vicroads.vic.gov.au/

Western Australia
https://travelmap.mainroads.wa.gov.au/Home/Map

And in Tasmania go to:

TasALERT

http://alert.tas.gov.au/Pages/Home.aspx

It shows all problems from Police, S.E.S. and Tas Fire Service.

Thanks Tony, useful links.