[OSM-talk] Roundabouts and routing

Graham Stewart (GrahamS) graham at dalmuti.net
Fri Sep 9 11:00:43 BST 2011


David Earl wrote:
> 
> In areas where it has been important for me (where I've been producing a 
> high quality paper map), I have tagged these as junction=approach.
> 
> The reason I needed such a tag was to avoid one way arrows cluttering up 
> the map on those little Y-shaped approaches to roundabouts

This seems like a bad approach to me. (pardon the pun)

If the road flares like that then those two road sections ARE one way. If
you do not tag them as such then you will confuse routing  software, which
will see two possible exits from the roundabout, rather than one on and one
off.

Looking at Mapdust/skobbler reports shows that incorrect tagging of these
approaches is a common cause of odd routing bugs like /"Nav said to take the
8th exit at roundabout, but there were only 4"/

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