In some areas lots of sand has been dumped trying to make a road and it does not work. Now the thought is to put hardcore and fixed. The problem is what lies under the fill. In many areas the fill has been place on top of non-compactable peateous material so it will beyond any doubt fail and continue to fail regardless of the amt of fill you dump unless the substrata is removed first. Road engineering is required.
A sensible solution is to use enzyme soil stabilizing techniques to avoid potholes and washouts and limit traffic to golf carts and 4 wheelers, no taxis or pick ups or construction equipment, just as the law currently reads, and we should have not so much problem. When any heavy traffic hits the roads will not withstand the weight due to what is underneath. A road that will handle low speed golf carts and 4 wheelers is different from a road carrying speeding loaded taxis and occasional heavy traffic. The substrata does not allow that kind of traffic without considerable engineering and lots of fill.