Tagging an implicit speed limit explicitly for example in town with maxspeed=50 is straightforward enough for Germany. It seems natural that no specialist knowledge is required for that kind of thing. For a German.
But let's look at some other countries for the default urban speed limit. Spain (ES): maxspeed=50 maxspeed:hazmat=40 Chile (CL): maxspeed=60 maxspeed:bus=50 maxspeed:hgv=50 Hungary (HR): maxspeed=50 maxspeed:tricycle=40 Kerala in India (IN-KL): maxspeed=50 maxspeed:conditional=40 @ (weight > 7.5) maxspeed:trailer=40 maxspeed:bus_articulated=40 maxspeed:hgv_articulated=40 maxspeed:bus:conditional=40 @ (weight > 7.5) maxspeed:hgv:conditional=40 @ (weight > 7.5) maxspeed:tricycle=30 Punjab in India (IN-PB): maxspeed=50 maxspeed:trailer=35 maxspeed:bus_articulated=30 maxspeed:hgv_articulated=30 maxspeed:hgv=45 maxspeed:hgv:conditional=40 @ (weight > 6) maxspeed:conditional=40 @ (weight > 6) maxspeed:trailer:conditional=30 @ (weight > 6) maxspeed:motorcycle=35 maxspeed:goods=45 maxspeed:goods:conditional=40 @ (weight > 6) Malta (MT): maxspeed=50 maxspeed:bus=40 maxspeed:hgv=30 maxspeed:goods=40 maxspeed:goods:conditional=30 @ (weight > 3) Poland (PL): maxspeed=50 maxspeed:conditional=60 @ (23:00-05:00) Zambia (ZM): maxspeed=50 maxspeed:conditional=40 @ (weight > 2.275) maxspeed:trailer=40 maxspeed:hgv=40 Because the maxspeed tag applies to all vehicles except overridden for a specific vehicle type or a conditional, specifying only maxspeed=50 in any of the above cases has to be considered wrong or at least incomplete. In other words, the tags you see above would need to be added in the case the speed limit is given explicitly. It is not so straightforward then anymore. So, maybe not for Germany, but as you see, in other places, this *is* specialist knowledge. No regular car driver in Punjab will be able to enumerate all these maxspeed rules. And, taking a less extreme example, I think the Polish OSM contributors wouldn't want to add this maxspeed:conditional=60 @ (23:00-05:00) to every single unsigned street in urban areas. Also, note this is only the urban speed limit, trust me, the default speed limit "for all other roads" (=rural) can be much more complex. Actually, don't trust me, see for yourself in the document I link all the time in the hope people would read it: https://wiki.openstreetmap.org/wiki/Default_speed_limits We can not get to any results or any progress on the matter of default speed limits (or for any topic, for that matter) if everyone just keeps arguing out of his best knowledge about his home region or country only. "It works for me" is simply not good enough for a global project. Cheers Tobias On 22/09/2018 01:03, Martin Koppenhoefer wrote: > > > sent from a phone > >> On 19. Sep 2018, at 21:16, Tobias Zwick <o...@westnordost.de> wrote: >> >> This is a good argument against tagging an explicit maxspeed=X when >> there is actually no speed limit sign around (X is what the OSM mapper >> by his knowledge about the law thinks should be the default limit here). > > > everything that you map will be according to your understanding of it, I > cannot see a good argument for not tagging implicit limits, even more as > there is judgement needed based on the situation (something humans can do > much better than computers). Every holder of a driving license should have > the requisites to recognize the speed limit on a given piece of road in their > local area, so it doesn’t require specialist knowledge. > > We already have a reliable way to distinguish implicit from explicit limits > (we even have several of them), if you want to treat them differently in your > app, you can do it. > > There actually is a speed limit on most roads, including those without > explicit signage. Omitting it will leave us in the situation that it really > becomes unclear whether there is no sign or nobody has bothered to enter it. > > Cheers, > Martin > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
