Hi Gerd,
I've added the code to optimize non-routable ways in r3059. Your example looks much better now.
That was fast. Result is much better, thanks! Can we fine-tune effect using option --reduce-point-density? Some observation: Map size seems to be nearly 10% less, compared to latest release r3057. I get many warnings like this: SEVERE (WrongAngleFixer): pbf\29487111.osm.pbf: non-routable way 101876024 was removed And some like this: SEVERE (WrongAngleFixer): pbf\29487111.osm.pbf: Removing wrong angles - didn't finish in 10 passes, giving up! There is difference in processing of non-routable lines and polygons, now outline of a building doesn't match polygon shape. I guess one change leads to another and probably would be good to apply your updates to processing polygons too. -- Best regards, Andrzej