There are three things in motion here, and not only this time, but all times before that roads and pavements go broke.
First, all the people that are skimming their cut from the assigned money for every project.
Second, Companies and workers that do not care about or know enough to build quality that holds.
Third, The total flooding catastrophe, with example below.
It wouldn´t even matter if they were building after quality guidelines, as this is far to much for anything to handle.