My experience mapping in Brazil is that trying to figure out the function (role) of a way in the urban system leads to a more readable map that helps users better orient themselves. It also results in better automated routing.
You can start by looking at the official classification of the city, try to map its classes to OSM classes according to their description, compare the result with other popular maps, then inspect road signs, making adjustments to a draft at each step. It's an iterative process. Not having an official classification, you can seek inspiration from popular maps, without copying of course. When it's reasonably mature, you can begin to make changes to OSM. Eventually, a discussion with a local community (if any) should take place to consolidate the result. If you are the only local mapper, try doing this first in a big city where more mappers can give you feedback. Traffic volume can help decide which way predominates locally, but it should always be considered relative to the surroundings, never in absolute. But traffic can be quite variable in certain ways (during the day, or seasonally), so it can also be an unhelpful indicator. Comparing classification with other cities in the world is useful to observe the expected distribution/concentration for each road class, but there is a lot of variation in this regard between countries and even between cities of the same country. This would be especially useful if (like here in Brazil) your country's community started out as isolated local mappers, each with a different idea about urban classification. On Mon, 14 Mar 2022 at 02:10, Graeme Fitzpatrick <graemefi...@gmail.com> wrote: > Question that came up in regards to a Note in Australia: > https://lists.openstreetmap.org/pipermail/talk-au/2022-March/015968.html > > Most of the streets forming the main traffic grid in the CBD of Brisbane, > Queensland are mapped as secondary, with others as tertiary: > https://www.openstreetmap.org/#map=16/-27.4704/153.0256. > > The highway wiki is more about open road highways & doesn't discuss the > use of the various tags to show the importance of inner-city streets, > although I did see one comment that seems to agree: > https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dsecondary > > Looking at other major cities, there's a wide variety obvious: > London: https://www.openstreetmap.org/node/107775#map=14/51.5081/-0.1222 > > Manhattan: https://www.openstreetmap.org/#map=13/40.7747/-74.0049 > > Berlin: https://www.openstreetmap.org/#map=14/52.5160/13.3917 > > Tokyo: https://www.openstreetmap.org/#map=15/35.6750/139.7555 > > As far as I can see, there's never been a discussion on CBD roads, so lets > have one! > > How should they be mapped? By the amount of traffic they carry, or what? > > Thanks > > Graeme > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > -- Fernando Trebien
_______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
