[Talk-GB] C roads again

[Derick Rethans]

On Wed, 13 Aug 2014, Robert Norris wrote:

> > Ignoring the source information for now, but I suspect it is very 
> > similar to rights of way information in that it is probably derived 
> > from OS maps.
> >
> > The following overpass query highlights the issue, Norfolk standing 
> > out as especially bad. This is just tertiary roads, there are issues 
> > with unclassified too. http://overpass-turbo.eu/s/4xS
> 
> AFAIK there are some (but very few) roads where the C number is sign 
> posted but not that I'm aware of any explicitly.
> 
> Whether any of these have ever been captured in OSM is hard to tell.
> 
> Unfortunately a brief cross check with Google Streetview, for the very 
> few tertiary roads with 'source:ref=survey' don't seem to bare much 
> scrutiny. The visible signposts don't have a 'C' in them. The 
> 'source:ref' bit is only on a short section of an otherwise longer 
> road anyway, so possibly a road split editing leftover.
> 
> Obviously source=survey tags it too imprecise to tell whether a ref 
> was surveyed.
> 
> However I am in favour of this edit, but I think the edit needs to 
> *only* change 'C' Roads, as some B roads are tagged tertiary.
> 
> e.g. using something like this:
>    <has-kv k="ref" regv="^C"/>
> 
> In the above query will prevent altering too many things.

It's not only "C" roads. When looking at Nairn (because of a reported 
storm damage to a road) I noticed lots of U-references. Have a look at:

http://www.openstreetmap.org/way/194703765

and surrounding area. I doubt those are on signs either, and should also 
go into official_ref.

cheers,
Derick