Hi Graeme, Good question. So cities generally post what is restricted, rather than what is explicitly allowed. For example, a "paid parking" rule is there to tell you that you *can't* park unless you pay, and a "parking 2-4pm" zone is there to tell you that you *can't* park outside of those hours. Some restrictions are easier to map in the affirmative (e.g. parking zone, but only for motorcycles), and this implies that no other vehicle or user class can park there. Other restrictions are easier to map in the negative (e.g. no parking, applies to everyone if unspecified). Either way, there is an underlying understanding that curbspace has a "default" status, and signs denote exceptions to that status. I suppose you could map all allowed uses of every street segment, but it would be far simpler to just map the exceptions. In the same way, I've never seen a city signpost something to the effect of "parking allowed for everyone at all hours". I'm sure there is probably the odd edge case, but signs and paint are expensive to create/maintain, so there are good reasons why cities don't do this.
In cities in Canada and the US where I've lived, the default is open; parking, standing, or loading of all modes and vehicles is permitted unless posted otherwise. But I wouldn't be surprised if other jurisdictions are closed by default. To handle those, a polygon could be created around these areas (or an existing boundary could be used) and a relation could be created to establish them as exceptions with a different default. The asset tagging scheme would still work the same way, though - the same tags (e.g. parking zone, applies to everyone) can be used to denote exceptions where certain activities are allowed. To answer questions like, "Where can I park/load/stand my vehicle?", a rules engine is necessary to consider the default, the time period in question, and the user/mode/vehicle in question. That's not specific to the curb - you'd need the same sort of thing to use OSM to answer questions like, "Where is the nearest open pharmacy at 9pm?" For for on what tagging could look like, specific examples of how we handle activity rules in the CurbLR spec are available on GitHub: https://github.com/sharedstreets/CurbLR/blob/master/Rule.md (I haven't written up what this would look like in OSM yet since it seems premature - I wanted to first share the general approach and see what the community thinks about point-based asset mapping.) On Thu, Jun 20, 2019 at 10:04 PM Graeme Fitzpatrick <graemefi...@gmail.com> wrote: > > > On Fri, 21 Jun 2019 at 12:43, Emily Eros <emily.e...@gmail.com> wrote: > >> I'd love to hear from people about what they think about this as a >> general approach. >> > > Wow Emily, that's a mighty task you've set yourself! > > How will it work when there are no signposts - eg residential streets > where parking is allowed but nothing to indicate it? > > Thanks > > Graeme > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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