On Sat, 23 Nov 2019 at 01:03, Nick Bolten <nbol...@gmail.com> wrote: > > These errors are an artifact of not knowing where the sidewalks and crossings > actually interface and having to guess about them.
It should be possible to solve this problem by specifying the width of the carriageway (width=*) and of the sidewalk(s) (sidewalk[:left/right]:width=*), shouldn't it? (This may be useful information anyway, no matter if the sidewalks are mapped separately or not.) If it isn't possible to specify the widths, the information to which sidewalk a crosswalk belongs could be given with a relation. > In contrast, pedestrian ways that are directly connected to one another can > be analyzed using any transportation network software and are compatible with > common OSM routers. This is true, but mapping sidewalks with separate ways isn't unproblematical either, especially if there aren't any marked crosswalks: mapping unmarked crossings is often impossible because not verifiable, but not mapping crossings results in disconnected sidewalks. A particular problem are T crossings with sidewalks on both sides of both streets, as for example here: https://www.openstreetmap.org/node/32860990 Besides, mapping sidewalks with separate ways requires quite good aerial imagery, which unfortunately isn't available everywhere (example [1]). Furthermore it takes much more time than adding sidewalk=* tags and you can break more – people that map sidewalks ways often don't map unmarked crossings, which results in unusable sidewalks (example [2]). Compared to sidewalk, mapping pedestrian lanes with separate highway=footway ways would even be more problematical, because the pedestrian lanes are a part of the carriageway of the road and (in some countries) can also be used by vehicles in order to make way for oncoming traffic. [1]: https://www.openstreetmap.org/#map=19/47.04825/8.30513 [2]: https://www.openstreetmap.org/way/682152784 Regards Markus _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
