I've seen various workarounds for how to create a sloped driveway using copies of meshes with SEO etc, or with numerous roofs etc, but never quite get the desired result.
With meshes you can't do a composite, with roofs you end up with many separate elements and controlling the slope can be time-consuming.
Wondering if this is where the shell tool would/could be used?
It's a tool that I have played around with a bit, but hit and miss if I could get the basic shape I was after.
Examples are the composite I'd like to use, and a generic image of a common driveway with changing slope and curved edges/
Just mouse-draw it from the download-button into Archicad to use it. It uses profile-manager-profiles that You can self´draw and bends it along the polygone. With SEO You can subtract it from Your terrain.
Have you tried using a rail tool as the road driveway?
(Using a custom profile rail defined in the Complex Profile Manager with your composite section, and then magic wand-ed onto your site mesh on a pre-defined path (polyline) with the gravity-to-mesh turned on).
Pros : very easily adjustable and controllable using the rail nodes in 3D and the Complex profile manager to adjust the profile, width, curbs, etc)
Looks very convincing in 3D depending on how much resolution you want.
Cons - doesn't display correctly in 2D plan window and might need a workaround of drawing the road path correctly in 2D using linework separate from the rail object (Graphisoft/Rail tool issue)