[OSM-dev] Creating 3-d connected network from ways + layer tag

[Igor Brejc]

Karl Newman wrote:
>
> The topology rules are simple--if the ways share a node, then they are 
> connected and it is possible to navigate from any of the connected 
> ways to another (subject to turn restrictions, etc.) The layer tag is 
> primarily a hint for renderers for proper display of vertically 
> separated features. If the data is otherwise, then it is an error and 
> should be corrected.
>
Then how do you handle double-decker bridges? 
(http://en.wikipedia.org/wiki/Bridge#Double-decker_bridge)

Regards,
Igor

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