2013/9/30 Philip Barnes <p...@trigpoint.me.uk>

> And canal tunnels, there is usually a towpath through the same tunnel, but
> we have to map them as separate tunnels, then there are double track
> railway tunnels.





IMHO this is the same as for bridges: we don't have a general standard how
to map a bridge or a tunnel, all we (there are exceptions, speaking about
the general consensus how "normal" mapping is done) currently do is
attaching an attribute to a road (or sth. else) stating that it is on a
bridge or in a tunnel, but we do not map the bridge or tunnel itself.

The solution could be a bridge object or a tunnel object (could be either
geometry or a relation) which would represent the actual structure, would
get tags like name (name of the bridge / tunnel, not of the road, i.e.
goodbye bridge_name), and so on. In the case of geometry this would be an
area outlining the feature, in the case of relations I think there is
already a proposal, but not very much used.

cheers,
Martin
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