@joost schouppe <[email protected]> To me that's indeed a bridge, as you see the same structure as on the motorway bridges : a platform supported by pillars....
A tunnel is generally something that was dig (removing earth/material) and consolidated from the inside (most often with concrete) like a subway tunnel if you want. It seems pretty rare to dig a big hole, make a tunnel and put back the earth on top ! ;-) I can't find example of tunnels that's really like "under a railway or motorway", so i would say that probably 99% of the tunnel are below ground or mountains/hills (if we exclude the obvious building passage that we classify as tunnel in OSM). They are generally longer than wide as someone quoted from wikipedia.
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