Re: [Tagging] How to tag correct number of lanes for freeway on/off ramps?
On 03/07/2020 17.53, Paul Johnson wrote: On Fri, Jul 3, 2020 at 3:19 PM Matthew Woehlke wrote: Consider https://www.openstreetmap.org/#map=17/42.85888/-73.77169. As I write this, I-87 is annotated as having 3 lanes south of the on/off ramps (south of 146). However, the off ramp starts all the way back at the Sitterly Road overpass, and the on ramp doesn't fully merge until just before the emergency vehicle turn-around only slightly north of said overpass. Accordingly, there are actually four lanes for these stretches. What is the correct way to model this? It's hard for me to explain so try the example in https://www.openstreetmap.org/changeset/87518597#map=14/42.8442/-73.7720 on for size? Thanks! In particular, TIL about the `placement` tag. Actually, the proposal page for that is rather helpful. A couple notes, though: you missed a transition, and IIUC, the `turns` should instead be `|||slight_right`, since there is no explicit 'straight only' marking. (Strictly speaking, there is no *explicit* marking for 'slight right' either, but it's implied by the fact that you're in a turn lane. I wonder if we should have a way to tag that separately? Anyway, I would hope that having the lane so tagged — I also tagged the on ramps |||merge_left — will encourage tools to not gratuitously route into those lanes only to need to leave them immediately, i.e. a better and more correct version of merge prohibition.) Anyway, I hopefully cleaned up most of the stuff for the on/off ramps here. (Hmm, I skipped the north-most on ramp though, maybe I'll do that one later.) It seems I need to take a look at JOSM, I've been wanting something that actually renders lanes... BTW, my "ultimate" goal, potentially, is to have fully and correctly modeled lane placement and connectivity. I'm working on traffic simulation with SUMO and basically need to be able to do perfect imports from OSM without having to clean up the network afterward. Plus, it can't hurt routing engines for this stuff to be correct. -- Matthew ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] How to tag correct number of lanes for freeway on/off ramps?
On Fri, Jul 3, 2020 at 3:19 PM Matthew Woehlke wrote: > Consider https://www.openstreetmap.org/#map=17/42.85888/-73.77169. As I > write this, I-87 is annotated as having 3 lanes south of the on/off > ramps (south of 146). However, the off ramp starts all the way back at > the Sitterly Road overpass, and the on ramp doesn't fully merge until > just before the emergency vehicle turn-around only slightly north of > said overpass. Accordingly, there are actually four lanes for these > stretches. > > What is the correct way to model this? > It's hard for me to explain so try the example in https://www.openstreetmap.org/changeset/87518597#map=14/42.8442/-73.7720 on for size? ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] How to tag correct number of lanes for freeway on/off ramps?
I believe the correct way is mapping it with 4 lanes where the 4th lane begins (with turn=|||slight_right) and put the motorway_junction where it splits. Then, the ramp gets 2 lanes and the main road 3. Às 17:38 de 03/07/2020, Matthew Woehlke escreveu: On 03/07/2020 16.28, Martin Koppenhoefer wrote: On 3. Jul 2020, at 22:20, Matthew Woehlke wrote: Accordingly, there are actually four lanes for these stretches. What is the correct way to model this? split the highway so that each way had the same number of lanes, then fix the lanes (4 rather than 3) where it applies I'm not sure what the first half of that is saying. Are you agreeing with my proposed mechanism? ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] How to tag correct number of lanes for freeway on/off ramps?
On 03/07/2020 16.28, Martin Koppenhoefer wrote: On 3. Jul 2020, at 22:20, Matthew Woehlke wrote: Accordingly, there are actually four lanes for these stretches. What is the correct way to model this? split the highway so that each way had the same number of lanes, then fix the lanes (4 rather than 3) where it applies I'm not sure what the first half of that is saying. Are you agreeing with my proposed mechanism? -- Matthew ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] How to tag correct number of lanes for freeway on/off ramps?
sent from a phone > On 3. Jul 2020, at 22:20, Matthew Woehlke wrote: > > Accordingly, there are actually four lanes for these stretches. > > What is the correct way to model this? split the highway so that each way had the same number of lanes, then fix the lanes (4 rather than 3) where it applies Cheers Martin ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
[Tagging] How to tag correct number of lanes for freeway on/off ramps?
Consider https://www.openstreetmap.org/#map=17/42.85888/-73.77169. As I write this, I-87 is annotated as having 3 lanes south of the on/off ramps (south of 146). However, the off ramp starts all the way back at the Sitterly Road overpass, and the on ramp doesn't fully merge until just before the emergency vehicle turn-around only slightly north of said overpass. Accordingly, there are actually four lanes for these stretches. What is the correct way to model this? I'm thinking, for the off ramp, the `highway:motorway_junction` should be pushed back, the relevant segment made 4-lane, and possibly get `change:lanes=yes|yes|yes|no`; the location where the ramp splits from the freeway should be left as-is (currently where the ramp actually separates from the freeway). For the on ramp, make the relevant segment 4-lane with `change:lanes=yes|yes|not_right|yes`. Is that the sensible thing to do, or is there another way? -- Matthew ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
