[Tagging] Feature Proposal - RFC - junction=intersection

Peter Elderson pelderson at gmail.com
Fri Jul 10 14:36:44 UTC 2020

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.floss at 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?
> https://wiki.openstreetmap.org/wiki/Proposed_features/junction%3Dintersection
> )
> --
> Matthew
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