It depends on what map is supposed to display. In this case I want a city-wide map with oneway roads that are potential candidates for designating them as contraflow for bicycles (all oneway roads without oneway:bicycle=no that are not a dual carriageways).
I implemented it using dual_carriageway=yes for identification of dual carriageways in https://github.com/mkoniecz/bicycle_map_of_Krakow/commit/e10ecfb8d54d9c6e6e7f6e327647017a1c656a5c I use also some other hints and together it is almost 100% effective (still some roads where contraflow would be completely unreasonable are marked, like http://www.openstreetmap.org/?mlat=50.05948&mlon=19.97578#map=18/50.05948/19.97578 ) but in general it is nearly 100% effective without any postprocessing. 2014-07-17 21:55 GMT+02:00 Paul Johnson <ba...@ursamundi.org>: > How is this, in any way, incorrect rendering, particularly at higher zoom > levels? > > > On Thu, Jul 10, 2014 at 4:07 PM, Mateusz Konieczny <matkoni...@gmail.com> > wrote: > >> Road itself is not oneway as it has two one-way carriageways in opposite >> directions. Carriageways are mapped in OSM as separate one-way ways. >> >> >> 2014-07-10 21:32 GMT+02:00 John F. Eldredge <j...@jfeldredge.com>: >> >> I am confused. You state that the road is divided into two carriageways, >>> that neither carriageway is one-way, and also that each carriageway is >>> one-way. How can a given carriageway be both one-way and not one-way at >>> the same time? >>> >>> >>> On July 10, 2014 5:20:16 AM CDT, Mateusz Konieczny <matkoni...@gmail.com> >>> wrote: >>> > I am thinking about marking tagging roads with separate carriageways. >>> > I >>> > want to create map with oneway roads, but in OSM data roads with >>> > separate >>> > carriageways that are not oneway are frequently represented as >>> > separate >>> > ways, both tagged as oneway. >>> > >>> > Adding tag that that would describe way as part of dual carriageway, >>> > with >>> > twin road leading in opposite direction would allow to solve this >>> > problem. >>> > >>> > I am currently thinking about good name for this tag and whatever >>> > there is >>> > possibly to achieve this result solely by processing OSM data >>> > (processing >>> > is probably necessary anyway to catch cases like >>> > https://www.openstreetmap.org/way/182138211 ). >>> > >>> > >>> > >>> ------------------------------------------------------------------------ >>> > >>> > _______________________________________________ >>> > Tagging mailing list >>> > Tagging@openstreetmap.org >>> > https://lists.openstreetmap.org/listinfo/tagging >>> >>> -- >>> John F. Eldredge -- j...@jfeldredge.com >>> "Darkness cannot drive out darkness; only light can do that. Hate >>> cannot drive out hate; only love can do that." >>> Dr. Martin Luther King, Jr. >>> >>> _______________________________________________ >>> Tagging mailing list >>> Tagging@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/tagging >>> >> >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> >> > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
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