[OSM-talk] Crossings of a road

[Shaun McDonald]

On 12 Jun 2009, at 14:44, Ed Avis wrote:

> Here the major road is a dual carriageway with a fence in the  
> middle, so
> pedestrians cannot cross:
>
> http://www.openstreetmap.org/?lat=51.490971&lon=-0.234075&zoom=18&layers=B000FTF
>
> There are subways which I have mapped as level=-1 paths crossing the  
> road.  But
> then this path is unconnected to anything else on the map.  I want  
> to express
> that you can walk along one side of the road, then use the subway to  
> get to the
> other side.
>
> To do that I could make the subway have junction nodes with the two  
> carriageways
> as it crosses them - but that's not quite right because it doesn't  
> physically
> cross the road, it goes underneath.  Or I could even put it just  
> between the two
> carriageways like a rung in a ladder, but that implies that to use  
> the subway
> you must walk to the middle of the road to reach it.  Or I could add  
> in somewhat
> bogus paths from each subway entrance back to the main road.
>
> I am concerned with providing useful data to routing program.  Are  
> there some
> I can test with to see what is expected?  Cloudmade Maps provides  
> directions but
> its data is not frequently updated.
>

You could place a footway parallel to the road and map in higher than  
normal.

Or bring the footway out to the end of the tunnel, roughly like so:
  |   |
-|--|-
\|   |/
  |   |
  |   |


Shaun

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