[Tagging] Crossing tagged on both way and node (was: What does bicycle=no on a node means?)

[Mateusz Konieczny]

Oct 18, 2020, 09:44 by tagging at openstreetmap.org:

> On 15/10/2020 17:36, Jmapb via Tagging wrote:
>
>> I've always been surprised to see a footway=crossing/cycleway=crossing
>> way with the intersection node tagged as highway=crossing. There's
>> only a single physical crossing, so this seems contra to the
>> one-feature-one-element rule.
>>
>> A highway=crossing node makes sense in an area without mapped
>> footways/cycleways. But if the crossing ways are mapped, routing
>> software will need to examine the intersection node and scan the
>> properties of all highways intersecting there. It seems to make
>> tagging the node itself redundant.
>>
>> Are there really routers that require the node be tagged as well?
>>
> Routers do not need highway=crossing to detect crossings, every node
> where 3 or more ways connect is a crossing.
>
Note that there are multiple cases where 3 or more ways connect without
it being a crossing.

Even after "any case where 3 or more ways connect, with at least one being
a road and at least 2 being a footway/path/cycleway/footway" amendment
not all of them will be crossing (footway joining terminal node of road,
two footways joinining road on one side etc).

Crossing may be in situation where just one footway line joins road.

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