I would suggest applying a material to the landacape from the spline, and then positioning properly INSTANCED static mesh components in all areas where it is possible.
Straight roads.
There is ways to apply them with the spline, then convert them, but you’d have to poke around for how to do it.
Flattening and applying a layer of paint to the landscape is usually necessary instead, forr a few reasons.
Chief among them is removing the landscape grass.
even if that may not be your case.
However with the flatten and texture applied, it is much easier to manually place parts in…