An interesting article about a melting road this week in northern QLD: http://www.abc.net.au/news/2018-07-05/melting-road-in-far-north-queensland/9942800.
Of course, bad roads can also occur in WA. What are your rights?
Main Roads does have a compensation policy in place, however it excludes many things, including extreme weather events, damage resulting from criminal actions, and debris.
To succeed in a claim, you will have to show that Main Roads failed to take reasonable steps to maintain the road network to prevent foreseeable risks of harm, that they caused the incident and you to suffer loss; and that the loss was foreseeable to them. These are the standard elements of tortious liability. If you need assistance with such a matter, contact a lawyer today.