I am noticing that no road embankment has been implemented in the landscape. This is particularly unrealistic in the case of mountain roads, whose section should always be on a horizontal plane even if the road is uphill and runs along the side of a mountain. The same applies to watercourses. This problem has been well implemented in XP. I think it can be solved off-line with an intermediate map processing step.
They first need to fix the mesh and elevation. Coastal roads hugging a rocky/mountain section are sideways vertically in many cases.