I ask this question in relation to my previous question on this topic: link here
This was resolved by Quellenform (many thanks!), but now I am encountering another problem:
When the road/curve is level on the ground without elevation it works like a charm, but when there is a strong elevation or the road makes sharp turns, the road surface starts to "wobble" within the faces that make up the surface. I exemplify this in the images below.
This results in the dashed or full white lines not 'sticking' to the road surface and disappearing in other places.
The problem also seems to get worse the farther off from the center (the curve).