The latter (after) version matches the traffic signal wiki http://wiki.openstreetmaps.org/wiki/Tag:highway%3Dtraffic_signals#Tag_all_incoming_ways
It makes sense to me and is the way I prefer. Tod -- Sent from my mobile device. Please excuse my brevity. Martijn van Exel <marti...@telenav.com> wrote: >Hi all, > >Here at Telenav we have been looking at complex intersections and we >have set about editing some of these intersections in a way we feel >represents the situation on the ground better than their original >state, and because of that, works better for us. We have received some >feedback on our edits so we wanted to take a step back and see what we >(as the OSM community) think is the preferred way to map these >intersections. > >So what are we talking about? Intersections like this one, where one >or more dual carriageways come together at an at-grade intersection: > >https://www.evernote.com/shard/s9/sh/6438c196-bb92-4f66-81dc-9b75186286ba/0e8f07ff527c6a85c0dec426b9b79f1e > >One of my colleagues at Telenav has remapped this intersection as >follows: > >https://www.evernote.com/shard/s9/sh/3491f1fe-6afa-4571-bc43-7cb31c9c2625/9dd47d1445fdcf03d3f0bbd93b8e0f92 > >The main difference, and the source of some feedback we have received >over the past few days, is that the dual carriageway roads are >straightened out, creating multiple intersection nodes (4 in this >case) instead of the original single intersection node that connects >all the incoming and outgoing ways. That technique turns out to yield >more reliable and correct routing and guidance ('keep left, turn >right') through these intersections in our testing. But of course, >that cannot dictate how we map as a community, so let's discuss. > >Some of the feedback we have received about these edits points to a >statement on this wiki page: >https://wiki.openstreetmap.org/wiki/TIGER_fixup#Braided_streets: 'It >is a reasonable and well-used technique to bring the ways of dual >carriageways back to a single point at intersections to facilitate and >simplify the mapping of control devices and turn restrictions.' In my >mapping across the US, my personal experience has been that this >technique is in fact used, but the 'after' technique with straightened >out ways is actually much more common. I personally prefer that >technique as well - I think it is more pleasing to the eye, represents >what is on the ground better, and is and easier to read. So my feeling >was that this mapping practice would not be disputed. It turns out I >was wrong, so I want to see what the consensus is on mapping >intersections of this type - or perhaps there is none and we can work >together to get there? > >Thanks, >Martijn >-- >Martijn van Exel >OSM data specialist >Telenav >http://www.osm.org/user/mvexel >http://wiki.openstreetmap.org/wiki/User:Mvexel >http://hdyc.neis-one.org/?mvexel > >_______________________________________________ >Talk-us mailing list >Talk-us@openstreetmap.org >https://lists.openstreetmap.org/listinfo/talk-us
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