Hi rojart,

many thanks for your hints. I preferred IceX or Freeworld3D because of the comfortable functions for adding roads, but I hadn't seen the road tutorial for L3DT before. I guess I will give it a try.
Surely a big advantage of L3DT is that the standard edition has everything to test the complete workflow including the import to MED/WED. And you are right: The pro edition is priced very reasonable, especially for the non-commercial user!

Thanks for your help!