Jumping back in here, I should clarify that I was mainly thinking about how to help Indonesia and other countries with developing Openstreetmap communities decide on ways to use the highway classification tags, when there isn't a national highway class system, or when it's not obvious how the local system should fit OSM tags.
In rural Indonesia, as in Australia, Canada, Brazil and other countries with remote, undeveloped areas, there are often roads that end at a settlement, and are the only way in or out, in contrast to places in Europe which have complex networks with many different options from point A to B. That's the simple case that I was thinking of: if a road ends at a city at A and it's the only route to the rest of the island, it's likely to be a trunk road. If it ends at a town, and it's the only connection from town A to all the other towns in the province, it's probably a primary road, and so on. This allows mappers to identify highway classifications based on the network in OSM data plus place=* classes, which are fairly objective and verifiable (when based on population plus services). I actually heard back from one of the HDM/HOT lead mapper in Indonesia, and he said that they often use a similar system, in more populated areas like Java which have many roads and clear administrative boundaries (unlike here in Papua): "[National roads] "Jalan Trans-" in every island use highway=trunk. "But personally, for other hierarchy, I recommend using [administrative] boundaries.: - highway=trunk through province boundaries. - highway=primary connecting districts [admin_level=5] to cities or towns. - highway=secondary connecting city or town to sub-district (kecamatan) [admin_level=6], connecting two sub-districts, and also connected with a primary road. - highway=tertiary connecting sub-district (kecamatan) to village (kelurahan) [admin_level=7], crossing village boundaries, and also connected with secondary road - highway=unclassified connecting between villages, and isolated houses." See: https://www.openstreetmap.org/changeset/72632172. - I've edited for clarity. So that matches my thoughts about matching highway classes with the settlements they connect as a main route, but also considers if it's the main road to a whole district, sub-district or (administrative) village. Generally every province (level 4) has at least 1 city and each district (level 5) has at least 1 town, so the two ideas usually match. So to put it together 0) Motorway 1) Trunk - national roads; the main roads that connect provinces to other provinces and cities to other cities. Start/end at cities. 2) Primary - main road that connect districts (the level below provinces) to other districts, and towns to other towns and cities. Start/end at towns (or cities). 3) Secondary - connect sub-districts to others, and villages to larger towns, by connecting to a primary road at some point. Not the main route in a district. 4) Tertiary - connect villages and hamelts to other villages, and connect to a secondary (or primary) road. Not the main route in a subdistrict. 5) Unclassified - connects hamlets and isolated dwellings to villages and larger areas, by connecting to a tertiary, secondary or primary road. Never a major through-route. - Joseph On 8/13/19, Paul Allen <pla16...@gmail.com> wrote: > On Mon, 12 Aug 2019 at 16:44, Philip Barnes <p...@trigpoint.me.uk> wrote: > >> There is at least one trunk road (green signs) which has a B >> classification. A6 to M6 near Shap. >> >> There's always one. Sigh. > > I'd expect it to eventually get a new A number. Possibly with a very large > value of "eventually." > > -- > Paul > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging