I actually disagree with this criticism. I think it is appropriate to tag a road based on its real-life designated classification. My reason for saying this is because it is entirely objective. There have been similar discussions before which generally conclude with a recommendation to make what is essentially a subjective decision.
In a previous message I wrote what I considered to be a hierarchy of highway=* tags. This would be adequate for simple routers to calculate a route. To fix the problem routers need to look at lanes, width, speed limits etc., and taggers need to tag these more thoroughly. It could be that a tertiary or unclassified road *is* better than a primary road *because* it happens to have more lanes, or is straighter. Andrew On Thursday, 16 July 2015, johnw <[email protected]> wrote: > Japan has a bad habit of tagging tunnels in remote mountain passes (on > trunk roads) as motorways because they are toll roads and have no > pedestrian traffic - but they are just a toll trunk road in a tunnel. it is > not a motorway. > > They have an even more horrible practice of aligning the unclassified - > trunk roads by andministrative levels - so a 100 year old national road > which is windy and single lane is “primary” - but the modern 4 lane bypass > road built around it 15 years ago is “tertiary” because it is a regional > road with no shield designation. > > They want to preserve the Japanese method of displaying the routes in the > Standard Japanese style. > > in Tokyo, it works. In the suburban countryside - it is a routing > nightmare for western routers - as the road designations do not match their > usage/purpose in many places. > > Breaking the “admin” classifications off the roads usage levels would be > very useful ONLY if there was some additional rendering of the admin > designation levels on the road (like a different casing color or dashes or > stronger colors or something) - something visible to go with the OSM road > level choices so whole countries are not “mapping for the renderer". > > > Javbw > > > On Jul 16, 2015, at 9:46 PM, Daniel Koć <[email protected] > <javascript:;>> wrote: > > > > There's a lengthy discussion going on polish forum about using > motorway/trunk tagging for our main highways: > > > > http://forum.openstreetmap.org/viewtopic.php?id=31488 > > > > It looks that whatever solution we will choose, there's no clear mapping > between OSM and country-level classification of highways, so it makes sense > to tag them also with well-known and complete local scheme, which could be > written down like: > > > > highway:class:pl=S/A/GP/G > > highway:category:pl=2/4/6/7 (the number is the same as the corresponding > admin_level) > > > > I'd like to know if this scheme works also for some other (still > probably not all) countries, so we could also use: > > > > highway:class:xx=* > > highway:category:xx=* > > > > as a general local-level classification scheme? > > > > -- > > "The train is always on time / The trick is to be ready to put your bags > down" [A. Cohen] > > > > _______________________________________________ > > Tagging mailing list > > [email protected] <javascript:;> > > https://lists.openstreetmap.org/listinfo/tagging > > > _______________________________________________ > Tagging mailing list > [email protected] <javascript:;> > https://lists.openstreetmap.org/listinfo/tagging >
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