[Tagging] Expressway=yes/no versus new tags "dual_carriageway=yes/no", "limited_access=", "grade_separated"=?

[Volker Schmidt]

I am not happy with this new page.

This tag is a tag with very strong local restriction: 2823 of a world total
of 3166 are in the Polish city of Krakow.
The vast majority of dual-carriageway roads elsewhere are not tagged in
this way.
This fact should be clearly stated prominently on the wiki page

Also the wording would need changing.
" whether or not a highway is a dual carriageway or divided highway" >>> "
whether or not a highway=* is *part of of* a dual carriageway or divided
highway"
The problem is that a real-world dual-carriageway "highway" corresponds in
OSM to at least two ways tagged with the key "highway" and you are not
intending to say, that by adding "dual_carriageway=yes" to a highway=* in
in OSM that way were to represent what normally in OSM is represented with
two ways.
But this confusion is fuelled by stating that you can use
dual_carriageway=no to indicate that a way does not represent a
dual-carriageway real-world road.

I think that the tag itself is a bad idea, and as it is used essentially
only in Krakow, maybe the best thing is to eliminate those local
occurrences and also declare "duel_carriageway=*" deprecated.as quickly as
possible.

Volker

On Thu, 20 Feb 2020 at 07:42, Joseph Eisenberg <joseph.eisenberg at gmail.com>
wrote:

> I've created a page for Key:dual_carriageway based on existing usage
> in the database:
> https://wiki.openstreetmap.org/wiki/Key:dual_carriageway
>
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