Yes, I believe in some cases they are signposted: in which case a ref=* is entirely appropriate.
W.r.t other commenters, I do not believe that it is the role of OSM to hold internal identifiers, however authoritative, for any object as a matter of course. Certainly they should not be placed in tags whose usage is widely used for both renderers and many other applications (For instance, I don't want navit to tell me turn left into U1699 MacNaughton Crescent<http://www.openstreetmap.org/browse/way/187103578>). Otherwise we'll start putting NLPG ref=* on every address, or if copyright permits, OSGB TOIDs on every object. Surely we aim to create our own map, not some copy of what the council holds. A secondary consideration is that we know that many of these 'authoritative' sources contain errors, both of commission and omission (I've blogged about several types of these). Like OSM and OSGB data, I am sure local council data are also prone to time-based degradation. A significant service which OSM can provide is a second independent look at the geography of Britain. I'm also interested in the criteria that Highland use to classify roads as tertiary or minor. The road to Acharacle School <http://osm.org/go/e4rnunoQ--> is a tertiary, but in fact is a short stub only serving the school. I'm not sure that using the council's classification (which may have much more to do with road maintenance, width etc., than the traffic distribution network) is most suitable for achieving a reasonably consistent road classification in OSM for the UK. (This is a different and much more complex issue, just look at Spain where every Community has felt the need to create its own road classification system). Jerry On Sun, Mar 17, 2013 at 12:13 PM, Derick Rethans <der...@derickrethans.nl>wrote: > "sk53.osm" <sk53....@gmail.com> wrote: > > > I've noticed that many minor roads in the Highland Region of Scotland > > have > > been tagged with ref=[CU]#### based on a PDF document from the regions > > transport department. I've altered a few of these where I've > > encountered > > them to official:ref=* as I don't believe that these are verifiable on > > the > > ground in any way. > > > > I'd be interested in what others think (these council based refs do > > appear > > elsewhere in the country: I can't recall ever seeing one on a road > > sign). > > I have seen one somewhere in Cornwall, so I don't think we can rely on the > renderer to decide whether to show it. > > Your approach with official:ref for anything not signposted and normal ref > for signposted C roads seems best to me. > > Derick > > -- > http://derickrethans.nl - http://xdebug.org > Like Xdebug? Consider a donation: http://xdebug.org/donate.php > twitter: @derickr and @xdebug >
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