Are there any Maps of Australia that discriminate between bitumen roads and unsealed roads (i.e. dust roads, gravel roads, dirt roads & 4WD tracks) ?
For example the free tourist maps available at the many tourist information centres and online at cartoscope. Find the sample on the left here.
Google Maps in satellite mode may help as well when zooming in. Also recommended for nature lovers are http://www.geomaps.com.au and https://nationalmap.gov.au/.