[Tagging] Mapping as two ways or one, u-turns

Vincent Pottier vpottier at gmail.com
Sat Mar 3 09:07:49 GMT 2012

Le 03/03/2012 08:49, Erik Johansson a écrit :
> There is nothing separating this road yet it is mapped as two ways:
> http://osm.org/go/0bCzcBhNM--?m
> http://goo.gl/KLTpu  (Streetview)
IMHO, it's a mistake.
> This is done for routers. Imagine you want to go from the marker to
> number 117, as it is mapped today the router will know that you can't
> go back on the same street directly. How can this be mapped with out
> mapping this as two ways, as it's said in the Editing standards:
> http://wiki.openstreetmap.org/wiki/Editing_Standards_and_Conventions#Divided_highways
IMHO, there is a lack of a tag saying that the road can't be crossed, 
except at crossings e.g. tag:crossable=no.
If it is forbiden to U-turn it at a cross, a restriction relation must 
tell it, or maybe a different tag if all crossings  are concerned, e.g. 

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