[talk-au] Roundabouts and routing

Ross Scanlon info at 4x4falcon.com
Thu Dec 17 05:40:49 GMT 2009


> And this is because of the way the roundabout has been drawn.  The first 
> exit (west on Ginninderra Drive) isn't being counted as an exit because 
> that exit point is also my entry point.  In other words, it shows that 
> one need not actually enter the roundabout to take that first turn.
> 
> I believe that this roundabout does not accurately represent the reality 
> of the situation.
> 
> I don't use Navit, and wonder if Navit users are seeing the same issue.
> 
> I have been editing and fixing cases like this as I come across them. 
> But I'd like to get the opinions of others, and even suggest a mention 
> in the "Australian Tagging Guidelines" if there's agreement.

Agree totally with John and likewise I have been editing roundabouts where this occurs.

No two ways joining a roundabout should join at the same node.

If you look at:

http://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout

You will see the correct way to map roundabouts, this will then render and route correctly.

-- 
Cheers
Ross




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