Hello ! I've been thinking about road hierarchy in OSM for a long time.
Classifying roads should be the same all over the world ! :O The highway tag shuffles administration grade (in England for example or for motorways), physical characteristics / abutters (example : residential, motorway), access, and importance (commuting and long-distance trip). I think the highway tag should be split into those 5 features : admin_level, abutters, access, commute_importance and long_distance_importance (by experience, there should be 6 levels for importance, from the cul-de-sac road to the main artery). Importance tags could also apply to bicycle path and footways :D Julien "djakk" Le jeu. 8 août 2019 à 22:26, Kevin Kenny <kevin.b.ke...@gmail.com> a écrit : > > On Thu, Aug 8, 2019 at 11:12 AM Peter Elderson <pelder...@gmail.com> wrote: > > > > We're on the same page. The pavement and separations argument just > > illustrates how local authorities may make the same distinction, and try to > > regulate traffic and safety informally. So here, I can use this for the > > classification, but in the next town it would probably not work. > > We're stuck with the hierarchy, but it doesn't really work that well > in most places other than the UK. > > In my area, there actually is a reasonable hierarchy that reflects the > relative importance of routes: > > motorway - Interstate, US, and State highways that are dual > carriageways with fully controlled access. (Some of the State Parkways > fall in this category but are named and not numbered.) > > trunk - some few special cases where a multi-lane dual carriageway is > only partially grade-separated from local traffic, or a 'super two' > where a single-carriageway road is grade-separated from local traffic, > with acceleration and deceleration ramps like a motorway. > > primary - my state designates most US Highways and some numbered state > touring routes as primary > > secondary - other state touring routes, numbered and bannered. > > tertiary - state reference routes, or numbered and bannered county > highways. State reference routes get an ´unsigned_ref=*´ since the > only field-visible marks of the numbers is a roughly 20x20 cm sign > showing the number and chaining. These markers have three four-digit > rows rows and are next to impossible to read from a moving car. Many > are collector roads that are prominently bannered, "TO NY 7", "TO US > 20" etc. > > The lower classifications are harder. We have had many arguments about > the boundaries, in rural areas, between 'unclassified', 'residential', > 'service' and 'track'. When you get into the North Woods, New York > has some public highways that are Pretty Darned Bad - I'm pretty sure > that I've tagged a "highway=track abandoned:highway=tertiary > surface=compacted tracktype=grade4 smoothness=very_bad" and decided, > "No, I'm not driving my Forester on this before scouting ahead." On > that particular road, there were indicia that would support any of the > five classes from 'tertiary' to 'track'. > > I've also put reference numbers for the highway system onto > 'highway=footway' - for roads that have been washed out or destroyed > in rock slides, where the bannering indicates a numbered route, the > actual route is marked with 'detour' signs, but the condition is > semi-permanent because there's never funding to rebuild the road. > There's actually a blazed long-distance hiking trail that follows some > of these sections, so 'footway' is appropriate, but the sections I > have in mind are impassable to anything on wheels. > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
