Hi Gerd,
is it intended that these ways are placed in the map? sample: http://www.openstreetmap.org/way/60575011
man_made=pipeline type=water location=underground
This rule in lines fires:
man_made=cable|(man_made=* & man_made ~ '.*pipe.*') {name '${name} (${operator})' | '${name}' | '${operator}' } [0x28 resolution 23]
I wrote this rule with visible features in mind, such as oil or gas pipelines in rural areas. In well-mapped urban areas, this can cause unnecessary clutter, just like subways and tunnels with access=private, which are being omitted by the default style. Maybe there should be a way to limit the visibility of some objects based on the map density or nearby map features. If a cycleway or highway is parallel to a pipeline, then the pipeline should be hidden except maybe in resolution=24. Likewise, if a cycleway is parallel to a highway, it should be hidden at lower zoom levels. If there are two antiparallel oneways for a highway=*, only one should be generated at lower zoom levels. Best regards, Marko