[Tagging] barrier=kerb + kerb=lowered

[Mateusz Konieczny]

Jun 7, 2021, 04:50 by jmapb at gmx.com:

> Offhand, it seems like textbook troll tagging to me, negating a tag with
> its own subtag.
>
Not really, kerb=lowered and kerb=flush is also for cases where
kerb is actually there.

barrier=kerb for many is not a barrier, but there is also barrier=bollard
- so anyone processing this tags need to check also its value anyway.

>  If the kerb has been lowered so that the footway is
> level with roadway, then not only is there no kerb but there's no
> barrier at all. Exactly the opposite.
>
I would say that for 
https://commons.wikimedia.org/wiki/File:Flush_kerb_IMG_20200927_134537.jpg
there is still kerb.

Yes, typically it is not a barrier (can be still problematic for the blind),
but typically barrier=bollard is also not a barrier (only for wider vehicles).

> Currently the wiki doesn't indicate that kerb=lowered and other kerb=*
> values are intended to be subtags of barrier=kerb. But it doesn't say
> they shouldn't be, either.
>
> https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dkerb
> https://wiki.openstreetmap.org/wiki/Key:kerb
>
I think that using them together should be documented.
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