Normally editors would warn you if your change would affect a relation, but I'm not across every exact situation. If you're editing ways which are members of relations it doesn't hurt to check what those relations are if you also need to update anything. On the other hand, I can understand that increases the burden to edit, so my take is still if you know something needs updating still go ahead and change the ways that need fixing, even if it breaks relations, better than the ways being wrong.
On Sun, 5 Apr 2020 at 20:43, <fors...@ozonline.com.au> wrote: > Hi > > Going a bit off topic, is there anything in the wiki about breaking > relations, ways they break, what not to do? I am always a bit nervous > editing members of relations. I guess you repurpose existing elements > rather than deleting and replacing, but I may be missing subtleties. > > Tony > > > For larger roundabouts I can see how the roundabout needs to be split and > > the "from" member would be the roundabout segment, for smaller ones I can > > see how the "from" would be the way leading into the roundabout and "to" > > would be the way leading out of the roundabout and there would be no > "via", > > depends on the roundabout. > > > > I haven't see anyone intentionally breaking things by merging, so I'd > > strongly recommend to leave friendly changeset comments (if you haven't > > already) because not everyone is on this list and for new contributors > and > > even experienced contributors mistakes happen, so changeset comments are > > the best way to try and limit breakage in edits. > > > > On Sat, 4 Apr 2020 at 22:52, Nemanja Bracko (E-Search) via Talk-au < > > talk-au@openstreetmap.org> wrote: > > > >> Hi, > >> > >> > >> > >> We could see that couple of users started joining ways that have an > >> attribute *junction=roundabout* into single way. > >> > >> By doing so, we recognize following (potential) issues: > >> > >> - We have added plenty of destination relations (overpass query > >> <https://overpass-turbo.eu/s/SlI>) across Australia, and by joining > >> roundabout ways into one, relation could be broken because members > “from” > >> are lost. In the same time, “intersecting” members haven’t been > added, so > >> the relation is invalid; > >> - If lanes (in real life) are changed within the roundabout (usually > 2 > >> lanes at some parts of the roundabout and 1 lane at the other), > >> attributes > >> regarding lane information are lost; > >> - Route relations could also be broken; > >> - If junctions are NOT roundabouts (but have a circular/elliptical > >> shape), and ref id’s were correctly set, after joining ways, refs > would > >> probably miss or just one would be present. > >> > >> > >> > >> Some examples: > >> > >> https://www.openstreetmap.org/way/717778304 > >> > >> https://www.openstreetmap.org/way/39804616 > >> > >> https://www.openstreetmap.org/way/717765311 - travaudat actually added > >> “intersecting” role, but it is clear that lanes are changed within the > >> roundabout > >> > >> > >> > >> I would ask users to try not to brake existing relations, and to note > that > >> multiple ways can be a part of single roundabout so it is not necessary > to > >> join these. > >> > >> > >> > >> Thank you, > >> > >> Nemanja > >> > >> > >> _______________________________________________ > >> Talk-au mailing list > >> Talk-au@openstreetmap.org > >> https://lists.openstreetmap.org/listinfo/talk-au > >> > > > > > > > > _______________________________________________ > Talk-au mailing list > Talk-au@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-au >
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