I have seen all sorts of roads in the US. In South Georgia, there is a section of pavement where the asphalt was mixed with about 8 cm pieces of granite. They are rather roof shaped and protrude from the roof surface about a cm. It is one of the roughest roads to cycle on that I have ever seen. It is hard to exceed 18 mph because of the vibration.

A friend of mine had an anecdote about doing a steep descent at 55 mph+ and rounding a swooping corner only to come up on 4" of pea gravel put down for fresh chip seal.

I have seen roads where there are potholes that have patches ontop of patches. I think I saw one that was 5 layers thick. It looked a bit like a step pyramid.

Fortunately, not all of the US roads are that bad. But we do have some pretty bad paved roads and they are not hard to find.