[Tagging] Is it possible to have highway=unclassified with ref tag?

Paul Allen pla16021 at gmail.com
Tue May 8 09:26:32 UTC 2018


On Tue, May 8, 2018 at 1:19 AM, Greg Troxel <gdt at lexort.com> wrote:

> Dave Swarthout <daveswarthout at gmail.com> writes:
>
> In the UK, there is a notion of A/B/C roads, and then unclassified.  I
> gather this means they are part of the network but not declared one of
> A/B/C.
>

Not quite correct.  In fact there has been a lot of speculation in this
thread that misses
the mark.

The UK has road classifications M (motorway), A, B, C, D and U, although
normally
C, D and U do not appear on signs or maps (technically, they should not
appear but
exceptions are known).

None of the classifications, other than M, necessarily tell you anything
about the
width or quality of the road (usually, they do, but it's not always the
case).  Instead they
tell you (approximately) about the traffic density and are (or originally
were) intended
to indicate a preference ranking of sorts.  If you want to get from X to Y
you'd try to
use motorways as much as possible, where you can't use a motorway you'd use
A
roads, where you can't use A roads you'd use B roads.  If you have local
knowledge
you might, on some routes, prefer a B road or even a C road to a motorway.

I've simplified a lot.  It's more complicated, and less sensible, than
that.  See
https://en.wikipedia.org/wiki/Great_Britain_road_numbering_scheme and
https://en.wikipedia.org/wiki/Roads_in_the_United_Kingdom#Classification

See also https://wiki.openstreetmap.org/wiki/Key:highway

Perhaps, if we reach a conclusion here, the documentation may need to be
updated to make things a little more clear.

-- 
Paul
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