> Il giorno 11/ago/2014, alle ore 18:28, Christopher Hoess <caho...@gmail.com> 
> ha scritto:
> 
> the term "viaduct" can be applied to both road and railroad bridges; it isn't 
> confined to roads.


+1


> They can't be parceled into "bridge:structure" because they conflict with the 
> ability to specify the individual spans (e.g., an arch viaduct), but these 
> would be a good target for moving into a subtag. "bridge=viaduct" has a lot 
> of existing uses because of renderer support.


The wiki says for viaduct
A bridge composed of a series of short spans. The spans may be arches, girders 
supported by piers, etc.


We should remove the word "short", because this is relative and depends on the 
scale and design. A famous example is in France:

http://www.fosterandpartners.com/m/projects/millau-viaduct/images/gallery/

Cheers,
Martin

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