Hello, I totally agree with you, the definition you provide, administrative-free, tends to the same osm map between countries.
djakk Le jeu. 15 févr. 2018 à 19:18, Fernando Trebien <fernando.treb...@gmail.com> a écrit : > Landing on this discussion several months late. I've just heard of it > by reading a wiki talk page [1]. > > Since 13 February 2009, the wiki [2] criticises highway classification > as problematic/unverifiable. This has also been subject to a lot of > controversy (and edit wars) in my local community (Brazil), especially > regarding the effect of (lack of) pavement. > > In trying to achieve greater consensus some years ago, I decided to > seek opinions elsewhere and finally I arrived at this scheme [3] which > I think is very useful, if not perfect yet. It can be easily > summarised like this: > - trunk: best routes between large/important cities > - primary: best routes between cities and above > - secondary: best routes between towns/suburbs and above > - tertiary: best routes between villages/neighbourhoods and above > - unclassified: best routes between other place=* and above > > For example, the best route between two villages would be at least > tertiary. So would be the best route between a village and a town or a > city. Parts of this route might have a higher class in case they are > part of a route between more important places. > > It surely raises the problem of determining optimal routes. Maybe a > sensible criterion would be average travel time without traffic > congestion. A number of vehicles may be selected for this average - > could be motorcycle+car+bus+truck, or simply car+truck. > > Early results in my area [4, in Portuguese] seem promising and have > produced more consensus than any previous proposals. To me, this > method seems to: > - resist alternations in classification along the same road > - work across borders (where classification discontinuities are > expected because each country is using different classification > criteria) > - account for road network topology > - work in countries with mostly precarious/unpaved roads or > without/unknown official highway classes > - work between settlements as well as within settlements > > Borderline cases are probably inescapable in any system that does not > use solely criteria that are directly verifiable - from the ground, or > from the law. Maybe, in certain developed countries, the system is so > well organized that merely checking signs/laws is sufficient. That > does not mean it is like that everywhere on the planet. > > OSM has so far received a lot of input from communities in developed > countries (mostly Europe, North America and Australia) and hasn't > given much attention to less developed/organized countries. What comes > closest to this is what the HOT Team does, but the judgment of road > classification one can do from satellite images in a foreign country > is much more limited than the criteria that have been raised in this > thread so far. > > I wouldn't endorse tags such as maxspeed:practical due to lack of > verifiability (it should be obvious that different types of vehicles > would achieve different practical speeds). It is better to use the > legal speed in maxspeed=* and describe the practical reason for a > lower speed using surface=*, smoothness=*, and, who knows, maybe the > not yet approved hazard=* [5] (though that is intended for signed > hazards, not subjective/opinionated hazards). > > For the sake of long-term sanity, I also wouldn't mix the purpose of > one tag with the purpose of other tags. To describe the surface, there > is surface=*, smoothness=* and tracktype=*. To describe access rights, > there is access=*, foot=*, bicycle=*, motor_vehicle=*, etc. To > describe legal speed, maxspeed=*. To describe curves, there's > geometry. > > Purpose, perhaps, is the main issue. What is the purpose of highway > classification? Is it to save us the work of adding extra tags? Is it > to allow the renderer to produce a cleaner output at low zoom levels? > Is it to allow routers to assume default speeds? Maybe to guide their > routing heuristics? Is it to express some sort of importance? If so, > by which perspective - urbanistic, traffic engineering, movement, > commercial value, cultural/fame, historic, some combination of those? > Should the purpose be the same in every country? > > It may be interesting to also discuss the classification adopted by > other maps. I don't have a reference for Google (originally TeleAtlas) > or Here.com (originally Navteq), but Waze publishes its per-country > road classification criteria in its wiki. [6-16] > > [1] > https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dtrunk#change_.22high_performance.22_to_.22high_importance.22 > [2] https://wiki.openstreetmap.org/wiki/Verifiability#Problematic_tags > [3] > https://wiki.openstreetmap.org/wiki/User:Ftrebien/Drafts/Generic_highway_classification_principles#Schematic_diagram_and_general_comments > [4] https://forum.openstreetmap.org/viewtopic.php?pid=674296#p674296 > [5] https://wiki.openstreetmap.org/wiki/Proposed_features/hazard > [6] https://wazeopedia.waze.com/wiki/USA/Road_types > [7] https://wazeopedia.waze.com/wiki/UnitedKingdom/Roads#Road_types > [8] https://wazeopedia.waze.com/wiki/Canada/Main_Page#Road_Types > [9] https://wazeopedia.waze.com/wiki/Commons/Road_Types/India > [10] > https://wazeopedia.waze.com/wiki/Brazil/Como_categorizar_e_nomear_vias > [11] https://wazeopedia.waze.com/wiki/Germany/Kartenlegende_(Deutschland) > [12] https://wazeopedia.waze.com/wiki/France/Classification_France > [13] https://wazeopedia.waze.com/wiki/Italy/Tipologia_delle_strade > [14] https://wazeopedia.waze.com/wiki/Indonesia/Panduan_Tipe_Jalan > [15] https://wiki.waze.com/wiki/%E9%81%93%E8%B7%AF%E7%B1%BB%E5%9E%8B > [16] > https://wiki.waze.com/wiki/%E3%80%8C%E9%81%93%E8%B7%AF%E7%A8%AE%E5%88%A5%E3%80%8D > > -- > Fernando Trebien > +55 (51) 99962-5409 > > "Nullius in verba." > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk >
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