New proposal for multi-level bridges and objects on bridges
I think this can be done much easier, without the relation and quite robust: Proposed features/Simplify man made=bridge mapping RicoZ (talk) 14:56, 20 June 2015 (UTC)
Covered=* under man_made bridge?
Discussion over at Talk:Key:covered#What_to_do_with_building.3Droof.3F.--Jojo4u (talk) 14:28, 4 October 2015 (UTC)
In Stuttgart there is a unusual foot/bicycle bridge with a wide steel net supporting the path. The type is called "Seilnetzbrücke" by Structurae with only 3 worldwide and no one of the same design (OSM, Structurae). The steel net is very wide and should not be tagged man_made=bridge in my opinion. man_made=bridge should outline the the supported structure of the bridge.