Am 30.09.2013 18:19, schrieb Martin Koppenhoefer:
> 
> 2013/9/30 Philip Barnes <p...@trigpoint.me.uk <mailto: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.

Sure, man_made=bridge/tunnel for the outline and bridge/tunnel relation
which are often both needed.

fly


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