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

[Mateusz Konieczny]

20 Feb 2020, 09:54 by voschix at gmail.com:

> This tag is a tag with very strong local restriction: 2823 of a world total of 3166 are in the Polish city of Krakow.
>
And used by a single person (me).
> 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
>
I added this info to the page.
> I think that the tag itself is a bad idea, 
>
Why?
> 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 <http://deprecated.as>>  quickly as possible.
>
I am against this.

It is niche and not very important
information but at least give some reason
before you propose mass reverts.

This information is both not
feasible to automatically derive from 
other tags and geometries and it is
actually used (probably just by me,
but still it is used).

This information is also verifiable,
has clear meaning and is not 
causing problems, as far as I know.
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