On Tuesday, April 10, 2012 09:46:00 AM Peter Dobratz wrote:
> I'm experimenting with the Java code from Traveling Salesman
> 
> http://wiki.openstreetmap.org/wiki/Traveling_salesman
> 
> I'm making library calls to the routing code and it seems that the
> router does not understand cul-de-sacs mapped as a single
> self-intersecting way. This got me thinking about different ways to
> possibly map cul-de-sacs.  I generally use Way with
> highway=residential or highway=unclassified.  At the end of the road
> there is a loop that intersects the same Way.  Here is one that I
> recently mapped:
> 
> http://www.openstreetmap.org/browse/way/158307363
> 
> Is this how people generally map these things?
> 
> One other possibility that I could think of was splitting the circular
> part at the end and tagging it junction=roundabout.  However, this
> would imply that the road is one-way, and I'm not sure that that is
> the case.  Typically there is no one way sign on the ground and people
> feel free to travel in either direction on these (though being a
> cul-de-sac they don't have a lot of traffic).
> 
> --Peter
> 
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If it really is just a cul-de-sac, I (and many others) tag them as 
highway=turning_circle.  

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