<div dir="ltr">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.<div><br></div><div>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.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 4 Apr 2020 at 22:52, Nemanja Bracko (E-Search) via Talk-au <<a href="mailto:talk-au@openstreetmap.org">talk-au@openstreetmap.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">We could see that couple of users started joining ways that have an attribute
<b>junction=roundabout</b> into single way.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">By doing so, we recognize following (potential) issues:<u></u><u></u></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="gmail-m_-8142525195351042487MsoListParagraph" style="margin-left:0cm"><span lang="EN-US">We have added plenty of destination relations (<a href="https://overpass-turbo.eu/s/SlI" target="_blank">overpass query</a>) 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;<u></u><u></u></span></li><li class="gmail-m_-8142525195351042487MsoListParagraph" style="margin-left:0cm"><span lang="EN-US">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;<u></u><u></u></span></li><li class="gmail-m_-8142525195351042487MsoListParagraph" style="margin-left:0cm"><span lang="EN-US">Route relations could also be broken;<u></u><u></u></span></li><li class="gmail-m_-8142525195351042487MsoListParagraph" style="margin-left:0cm"><span lang="EN-US">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.<u></u><u></u></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Some examples:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://www.openstreetmap.org/way/717778304" target="_blank">https://www.openstreetmap.org/way/717778304</a></span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://www.openstreetmap.org/way/39804616" target="_blank">https://www.openstreetmap.org/way/39804616</a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://www.openstreetmap.org/way/717765311" target="_blank">https://www.openstreetmap.org/way/717765311</a> - travaudat actually added “intersecting” role, but it is clear that lanes are changed within the roundabout<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">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.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Nemanja<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
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