I don't know if this still applies under law. 
 
In days gone by the RAAF would close the road between Salisbury and Elizabeth once a year. They would try and pick a very quite Sunday,, to not offend too many of the locals.
They done this to maintain rights over the road. even though the road was a public use road on all the maps it could be closed when the RAAF liked (if needed). 
I understand that they would loose the legal ability to close at will if the public had free access to the route on a continuous basis over a given period,,, how long I don't know,,, but the RAAF's answer was an annual closure.
 
Perhaps this had been done by the national parks in this case. 

 
			
		
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