Spline Road - Tessellation and Blending

Hey guys,

so I have a simple material with a displacement map set on a plane, which will go into a landscape spline for a path / road.

However is there a opportunity that the terrain is not glitching inside my tessellated geometry?

Searching for tuts etc. but no one seems to like to have this feature ;D And I have another question as well - Sm have an idea how to blend my path (spline) into the landscape?

After working manually through the terrain - I experiencing shadow glitches as well. Turning off “cast shadows” doesn’t work either.