When cleaning up a duplicated way of the Radel-Thon cycleway around Stuttgart, Germany, I managed to somehow delete a part of it - luckily the nodes still existed. (It involved a condition 412 and me manually editing the OSM file - don't ask.) I re-created it as good as I could, but there is a small part in Hedelfingen crossing the Neckar where it shares the nodes of a road - but I don't know which, since neither osmarender nor Mapnik show the route above the roads. Please redo if you know. Thanks.