[Talk-GB] Using statutory 'list of streets' for mapping

[Paul Berry]

>  Personally I would stick with the OSM tradition of the on the ground
rule. If the signs are in place, then it is still a B road.

As others have said, old signs can hang around for decades before being
replaced, especially in rural areas. As such I would cross-reference with
other signs on the ground, including the *absence* of signs you'd expect to
be there, before drawing conclusions about road numbers. Furthermore there
are examples of roads that are simply mis-signed and that have never been
correct "on the ground" - we do love a counterexample.

Regards,
*Paul*

On Wed, 4 Aug 2021 at 10:05, Mark Goodge <mark at good-stuff.co.uk> wrote:

>
>
> On 04/08/2021 08:08, Edward Bainton wrote:
> > Hi all
> >
> > On a note <https://www.openstreetmap.org/note/1312848> near me a
> > contributor has queried whether a road has been downgraded from B662 to
> > unclassified.
> >
> > It passes through Cambs and North Northants.
> >
> > Cambs's statutory list of streets strongly suggests it has indeed been
> > downgraded.
> >
> > Northants doesn't maintain a 'list', but instead puts theirs in a GIS
> > combined with OS data. (marked copyright Crown & OS)
> >
> > Can we legitimately use either of these sources to determine the status
> > of the road? (both linked from the note) My hunch is first, yes; second,
> > no; but thought best to check.
>
> OS OpenRoads is OGL and can be used to derive data for inclusion in OSM.
> That will show the road status and official number, if classified.
>
> > Also what do we do if the signs and the statutory lists are at variance,
> > as it seems they may be?
>
> In this case, I'd be inclined to go with the official status, provided
> it can be definitively verified from open data sources. Signs are,
> unfortunately, sometimes wrong, and even more often are left unchanged
> after a road has been renumbered or upgraded/downgraded. It would be
> rather daft if OSM was the only map which continued to show a road as
> having an obsolete status, when every other mapping agency shows the
> current status, simply because some inefficient highways department has
> accidentally left a sign in place that should have been removed.
>
> Mark
>
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