[Tagging] Proper Tag for Not-a-Roundabout

Dave F davefoxfac63 at btinternet.com
Tue Nov 8 10:58:20 UTC 2016

Looking at your first routing example, I'm failing to understand what 
the problem is. As it's not a roundabout OSMR appears to be give clear 
accurate information. Why would you want it to "issue special 
instructions"? Are you asking us to add a 'this is not a roundabout' tag 
to fool OSRM into thinking it's a roundabout?

I believe your second example is a roundabout

Dave F.

On 07/11/2016 14:30, Daniel Hofmann wrote:
> Over at OSRM we're not only doing Routing on OSM but also Guidance for 
> users once a suitable route is found. In order to make the user 
> experience great and the instructions pleasant to use we differentiate 
> between
> 1/ Roundabouts
> Think: "at the roundabout take the nth exit"
> 2/ Roundabout Intersections
> These are roundabouts with up to four ways and turn angles which makes 
> the turns obvious.
> Think: "at the roundabout turn left"
> 3/ Rotaries
> These are large and named roundabouts.
> Think: "at Meinplatz take the nth exit"
> 4/ Not-a-Roundabout (what this post is about)
> There are situations where one of the entering road has right of way, 
> which disqualifies the scenario for being classified as a roundabout. 
> The Wiki has a section on these Not-a-Roundabouts:
> http://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout#Not_a_roundabout
> > In all these cases, the key “junction” is not necessary at all. You 
> need no special tagging.
> Most of these Not-a-Roundabouts have a note on them, telling users not 
> to tag them as junction=roundabout as this is a common mistake. Here 
> are two examples in Berlin:
> Bersarinplatz
> http://www.openstreetmap.org/way/288767318#map=19/52.51849/13.45355&layers=D
> http://www.openstreetmap.org/directions?engine=osrm_car&route=52.51786%2C13.45348%3B52.51918%2C13.45281#map=19/52.51852/13.45327
> Kottbusser Tor
> http://www.openstreetmap.org/way/159155852#map=19/52.49898/13.41881&layers=D
> http://www.openstreetmap.org/directions?engine=osrm_car&route=52.49915%2C13.41952%3B52.49857%2C13.41852#map=19/52.49896/13.41865
> As you can tell, for both of those situations the routing engine is 
> not able to issue special instructions since there is no tag to parse. 
> And parsing note tags for the occurrence of roundabout is not a 
> solution ;)
> With the current situations of having note="don't tag as roundabout" 
> pseudo-tags on most of those it would make sense to establish a proper 
> junction=not_a_roundabout tag (tag is up for discussion) software can 
> parse and make use of.
> What's your opinion on Not-a-Roundabout?
> Cheers,
> Daniel J H
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