[OSM-talk] Vertical ways (staircase)

[Jean-Marc Liotier]

> 2010/1/5 Lester Caine <lester at lsces.co.uk <mailto:lester at lsces.co.uk>>
> 
> A structure with 2 nodes one above the other would be necessary for 
> things like this:
> http://www.schmickler-metallbau.de/images/ref/WBH/Niederehe_Leiter.jpg

I believe that one node is sufficient. This node must have no level and 
must somehow be typecast as a ladder (or a lift - same problem). The 
levels must be attributes of each connected ways.

Schematic example :

way (level=0) --- node (highway=ladder) --- way (level=1)

There is surely more than one way to do it, but this is the one that 
feels natural to me.