Back in the late 80's I went up to one of the coal mining towns in west central Queensland to build and renovate company houses. We had to travel over what was called a Developmental road (about 50 miles, mostly formed by bully and grader), it was virtually only single file and if something was coming the other way, one would have to pull off to let the other through. Luckily nothing did. Would never have got through in the "Wet" as it's known here.
Any way, getting near the end, all of a sudden it turned into a curbed and channeled fully sealed double carriage way for several miles before returning back to dirt and gravel for a short distance before reaching the mining town.
On asking the locals about this phenomenon, I was told "Oh, that's beside so and so's (local state govt member's) property".
We did have a big enquiry into corruption a few years later but of course none of the key players got convicted.