Andrew Errington wrote: > I think that for any particular country, the official classification > hierarchy should be mapped on to the OSM hierarchy. If this is not
Countries are different in this regard. For example, here we use the official classification for all rural state operated roads, and they can be identified just by which range the road number is in (1-29, 40-98, and so on). (Being a motorway overrides this "by-number" system.) However, in that system, "officially" most urban roads are just roads with numbers over 10 000 (generally not signposted) and undistinguishable from each other; sometimes the main road through a city is state operated, sometimes just guideposted as "route to road #n". So in urban areas, unless the state classification calls for a higher class, the local mappers have to consider which roads are "important regional roads" (trunk), "regional road / arterial", "minor arterial", "collector roads" - the rest are below tertiary. For each class, there's a list of hints to compare when unsure. It could, and did in some places take some iterations before some suburbs had a consistent hierarchy, but the result is added value from the local contributors. -- alv _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
