Explain recurring potholes

MAYBE those in the know can write here and explain to road users why potholes appear on our roads, especially in Port Moresby after a heavy downpour.
From my reading, a pothole is a depression in a road surface, usually asphalt pavement, where traffic has removed broken pieces of the pavement.
It is usually the result of water in the underlying soil structure and traffic passing over the affected area.
Potholes are caused when water penetrates tiny cracks in the road – cracks that are usually caused by traffic.
When this water freezes, it expands, widening the cracks.
Pavement preservation is pothole prevention.
Most potholes can be prevented by using preservation treatments early on before severe distresses are formed.
Sealing cracks in a pavement is the most important step in preventing potholes.
I have seen work being carried out to patch those potholes but within days of a downpour, potholes appear again.
That seems to be an international practice.
Maybe, it is different in Papua New Guinea, especially Port Moresby.
I know that taxpaying road users would love to know how you stop potholes from happening.
Someone tell us.
Maybe an independent person, one who does not work with National Capital District Commission’s engineering department.

Taxpayer,
Pom