This idea works really well 
Solid operations are far quicker and cut/fill volumes are the same.
road_terrain_2024Aug23b.gh (411.9 KB)
Mesh faces are culled when their centers are more than five times the road width away. Improvements could be reducing the jagged shapes and re-integrating mesh fragments.
P.S. Re-integrating culled mesh fragments is easy and relatively quick (orange group). The slowest part of all this, not reflected in Profiler times, is just rendering a large mesh with so many faces.
road_terrain_2024Aug23bb.gh (413.4 KB)
NOTE: Disabling the MeshB cluster in the orange group saves ~10 seconds and looks fine showing only the holed mesh terrain from CullF.
