On Tue, May 8, 2018 at 1:19 AM, Greg Troxel <g...@lexort.com> wrote: > Dave Swarthout <daveswarth...@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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