Apparently in Brisbane they resurface the whole area rather than patch because it ends up cheaper in the long run. I grew up in the Hunter Valley and they had the worst roads I have ever seen because they were just patch on top of patch on top of patch. It was a bit of a local joke.
Water is the enemy of roads, if it doesn't get drained away correctly it will wash away the load bearing surface. Remember our Tar/Macadam roads are just a better version to what the Romans made 2000 years ago.
Here is a photo of a road with not a glob of bitumen to be seen anywhere! ;-)
This is what the most famous unit in the Australian Army, 91 Forestry Squadron RAE (my unit! ;-) ) would have made if required ;-)
Well your pictures road has got the grip part down pat.
I know concrete roads are alot noisier but apparently last much longer.
What would their cost comparatively be though?
They would be better off pressing and leveling clay off, then to make temporary patch jobs.
Then resurface the whole thing... properly.
I have seen the patches that stick up just a touch explode when a truck hits them.
Not a welcome experience when it happens to the patch on the road diagonally to you from a truck traveling the opposite way.