Hi Pilou and Jean. Thank you for taking time to respond. I used the Shapebender Tool but it does not fulfill both criteria required.
It must maintain 1:200 gradient It must remain 25m below terrainIn a road example, the road would have a gradient and remain on the mountain surface crossing contours. If I could accomplish the mountain road I could transfer the centre line down to the required depth. The only guidance the road would have is the given contour set and terrain.
Thanks
Garry
Alpine road 2.jpg