The story behind potholes?

Gordon from Halswell

The real issue is not the seal on the top, which show up as 'pot holes', but more the foundations underneath. The foundations move under the weight and speed of the vehicles, which we see as cracks on the surface, which due to more heavy truck end up as being potholes. Add a few rainfalls filling the cracks, Bingo!! potholes.
The foundation moving causes the top seal to crack and no amount of patching up potholes will work for any length of time as the surface now has a weakness. Eventually, the road has to be reconstructed with new foundations.
The GVT and councils expect to reseal the top layer as it will wear out, but once the foundation ceases to be solid, the top will continue to crack and potholes become a major problem for ratepayers.
Most of this is due to allowing Heavy Truck 20% heavier to use roads that were not built for them and using efficiency and cost savings to justify the change. This produced 'UNEXPECTED CONSEQUENCES'
The Gvt has to give Transport Companies a return on their investment $$$ for their political backing.

The GVT is now working on SPEED for more EFFICIENCIES and 'UNEXPECTED CONSEQUENCES' should not be unexpected this time.
"SPEED KILLs" so expect it to kill more even on motorways, especially Urban motorways.
This is my opinion backed up with obvious examples.