Seems like tagging “noise” to me. I’d expect a router to use the roundabout itself because exiting, making a U turn and then re-entering the roundabout will be longer and thus slower. Since the no U turn relations are there to make routing work and a reasonable router won’t need them, I’d say they are “noise”. If I were to go in to fix something on that intersection, I’d probably remove the no U turn restriction(s). But I don’t think I’d go out of my way to find them.
Cheers! > On Apr 4, 2018, at 4:36 PM, [email protected] wrote: > > I’ve noticed that someone from the Microsoft Open Map team is very busy > adding turn restrictions all over the place ( > https://www.openstreetmap.org/user/shawat94/ > <https://www.openstreetmap.org/user/shawat94/> ). > > In my local neighbourhood, I noticed that he added no_u_turn restrictions to > all the nodes where a road into in/out of a roundabout is splitting (because > of physical separation). Which basically amounts to 4 no_u_turn restrictions > for every single roundabout. > > e.g. here: > https://www.openstreetmap.org/changeset/57747093 > <https://www.openstreetmap.org/changeset/57747093> > https://www.openstreetmap.org/changeset/57674063 > <https://www.openstreetmap.org/changeset/57674063> > > There is no actual no_u_turn sign in any of these locations, it’s just > (mostly) physically a bad idea to attempt a u-turn here. > > Just a few weeks ago I discussed exactly this in #osm and the conclusion was > that it was neither necessary nor desirable to do this. > > I made a comment about that to the first of the two changesets linked above, > but haven’t gotten a reply. > > So, what is the general opinion about this here? Should these turn > restrictions be created or not? > > Cheers, > Thorsten > _______________________________________________ > Tagging mailing list > [email protected] <mailto:[email protected]> > https://lists.openstreetmap.org/listinfo/tagging > <https://lists.openstreetmap.org/listinfo/tagging>
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