I noticed some time ago that there is some controversial documentation on the wiki regarding the mapping of footway=crossing+cycleway=crossing vs. path=crossing. Since I’m currently trying to collect all these loose ends and derive the really™ proper™ tagging for these paths, I noticed that the tag path=crossing is indeed not part of any proposal. It was simply added by the user Tomasz W in this changeset. While it adds a nice table with examples, it also postulates the use of path=crossing, whereas all other pages (plus the original proposal) contradict this by saying that one has to use both footway=crossing+cycleway=crossing.
So the page currently contradicts the approved proposal, which never even mentions path=* (but says "[…] a way connecting the sidewalks on the two sides of the road should be mapped […] footway=crossing. Additionally, if the crossing is also for bicycles, you should add cycleway=crossing"). The footway=sidewalk Wiki-page also lists path=sidewalk as a common mistake, which makes path=crossing even more controversial.
The path=crossing-Wiki-page also redirects to footway=crossing, but not so for the Polish Wiki-page for path=crossing which makes it look like this is/was mainly a Polish tagging-agreement.
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footway=crossing + cycleway=crossing
I tried to find at least some sort of discussion about the change, but to no avail. I sent that user a message via OSM and email - no reply after one week. Does anyone know anything about a discussion that I’m unable to find?
To make it clear: I’m not against the use of path=crossing as a shortcut to footway=crossing+cycleway=crossing, but it’s not even documented. It just appears in the examples for footway=crossing but it’s not explained there at all. Plus, if path=sidewalk is officially a tagging mistake, it should either be re-allowed for the sake of consistency, or path=crossing should be considered wrong tagging as well.
I don‘t know about any discussion, but as footway=crossing is a subtag for highway=footway and cycleway=crossing is a subtag for highway=cycleway, the only logical subtag for a highway=path that is crossing a road can be path=crossing.
I think that’s a misunderstanding: footway=* is not a subtag of highway=footway. A lot of people even wanted footway=* to be an independent tag, usable without any highway=*. In the proposal, it’s explicitly stated that it can also appear on other highway=*-types, e.g., highway=steps. Digging further, cycleway=crossing says:
Looking at it again, there is also no page stating that footway=crossingandcycleway=crossing should be used on a highway=path that is designated for both and crossing a road. There is no documentation for that case at all, at least not on the pages you linked to.
Osmose has complaint - which I consider as unwanted and misleading - about highway=path footway=sidewalk for combined footway/cycleway which are sidewalks.
Some people in Polish community believed that this Osmose warning is a correct one and retagged many ways (some of them were using path=sidewalk / path=crossing, some were removing correctly tagged footway=sidewalkfootway=crossing)