Question: does it break anything? I am thinking about existing relations of various kinds.
Best, Peter Elderson Op vr 10 jul. 2020 om 16:17 schreef Matthew Woehlke < mwoehlke.fl...@gmail.com>: > As some of you may recall, I'm working on a project to do traffic > simulation with the help of OSM data and SUMO¹. > > One of the issues that SUMO has is that the typical method of modeling > intersections (which I don't propose to change, mostly) results in SUMO > thinking there are multiple intersections where there should only be > one. For example, intersections of two dual carriageways produces four > intersections and makes the turns much sharper than in reality. > > My use case isn't the only one that has issues with this sort of thing; > routers can "see" more traffic lights than actually exist and can (so I > hear, anyway) give directions that are potentially confusing. > Intersection modeling is a long-standing issue that has had multiple > previous proposals. > > The major two prior proposals of which I'm aware are to map the > 'footprint' of the intersection as an area, or to create relations to > map the intersection. Both are difficult, both to model, and for tools > to parse. The area proposal has potential rendering issues. > > I am proposing² a *much* simpler alternative, which is to simply tag the > portions of a road that are "part of" an intersection (i.e. the 'm', > 'n', 'p', 'q' segments of > https://wiki.openstreetmap.org/wiki/File:Doublejunction.svg) with > junction=intersection. This is straight-forward to model, and I believe > solves most of the issues for a majority of affected intersections. > (Exceptions likely exist, but 'perfect' is the enemy of 'good', and > right now we're at 'bad'.) > > Comments would be appreciated! > > Also, should I start just doing this for the areas I'm trying to use for > my project, or is it better to wait for some degree of consensus? > > (¹ https://www.eclipse.org/sumo/) > > (² > > https://wiki.openstreetmap.org/wiki/Proposed_features/junction%3Dintersection > ) > > -- > Matthew > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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