My missus drove through a pot hole on a local road, it smashed the sump and lower crank case off and totalled the car.
The same pot hole forms every year because there is a seasonal spring directly under the road. They patch it up in Summer when it was dry, but never fix the underlying issue.
There is a area of the road nearby my house that the pavement sinks into the ground. Every year they come pave over it again to level it out. I've heard estimates that the pavement there is over 10 feet thick. It just keeps slowly sinking. I don't think it has ever occurred to anyone to actually fix the problem.
I'm sure they have and realized the cost. It would be a maintenance issue and the cost would blowout the budget for maintenance. They concluded repairing ten spots permanently and repairing one spot temporarily was better than one spot permanently.
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