[Tagging] Turning circle with island or turning loop (was Re: (Mini)Roundabout: examples

Josh Doe josh at joshdoe.com
Mon May 14 15:42:57 BST 2012

On Sun, May 13, 2012 at 3:32 PM, Martin Vonwald <imagic.osm at gmail.com> wrote:
> Hi!
> As promised I created a few (positive/negative) examples of
> roundabouts, mini-roundabouts and turning circles to prevent
> misinterpretations in the future. [...]
> You can find the examples here:
> http://wiki.openstreetmap.org/wiki/User:Imagic/Werkstatt#Danger_of_confusion

It looks good to me, except for the last example of a "turning loop"
as I've been calling it. We're going to have the same problem with
this one, because they are abundant and very small, thus people will
likely mis-tag it rather than drawing a tiny loop. When I fixed up
some of westendguy's mini_roundabouts, he often used the tag with
these cul-de-sac turning loops, and I tagged it as junction=roundabout
and note=turning_loop so it could be checked/fixed later. Checking
taginfo, someone else tagged these as highway=turning_circle with a
FIXME [1]. Others have indicated they do highway=turning_circle and

The first question is if these can be considered a roundabout if there
is at least one driveway that connects to it (this would be my
choice), as is most often the case. If not, then we need some way to
differentiate these from highway=turning_circle and
junction=roundabout, though I'm not sure what tag is best.

[1]: http://taginfo.openstreetmap.org/tags/FIXME=Not%20a%20true%20%22turning_circle%22%20because%20of%20an%20island%20in%20the%20middle.%20Needs%20to%20be%20drawn%20completely.

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