[OSM-talk-be] bridge or tunnel?

[Lionel Giard]

@joost schouppe <joost.schouppe at gmail.com>  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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