Watch a video on roman road construction methods. It seems they prided themselves on building for the long term.
Retrieval augmented generation from incomplete archive:
The foundation of the road consists of 3’ of gravel covered with 2’ of sand forming an extremely stable base.
I seem to also recall that builders got paid half upon completion and half if the construction was still in good condition fifty years later. (Though this is probably apocryphal for the obvious reasons)
