On 14 April 2011 09:59, Steve Doerr <[email protected]> wrote: > On 14/04/2011 08:21, Peter Miller wrote: > > > > On 12 April 2011 15:39, Steve Doerr <[email protected]> wrote: > >> On 12/04/2011 15:16, Ed Avis wrote: >> >>> > > However, one flaw is that the speed limit sign is not for 'dual >>> carriageway >>> limit applies' but rather 'national speed limit applies'. So we still >>> would not >>> be tagging exactly what appears on the sign, but adding some additional >>> interpretation. I think that is fair enough, but those who hold to a >>> strict >>> on-the-ground principle may disagree. >>> >> >> > > I was going to make the same point. >> >> maxspeed:derivation=national_dual|national_single|motorway|restricted ? >> > > > I think we are getting there. Two points: > > 1) The phase maxspeed:type has already be proposed and is in use in some > places. Can I there suggest maxspeed:type rather than maxspeed:derivation. I > think that will also be more understandable to people who's first language > is not English. > > 2) In place of 'national' can I suggest 'GB:' to fit with international > conventions. > > Which brings one to the following: > > maxspeed:type=GB:dual|GB:single|GB:motorway|GB:restricted > > But that then negates the point Ed was making and that I was agreeing > with: that the sign says 'national speed limit applies' for the first two. > So my suggestion conveys two pieces of information in one tag: > > - the road is subject to the national speed limit (because of a sign); > - the road is dual or single as the case may be (because the mapper has > observed it to be so). > > It also preserves explicitly the distinction between the national speed > limit (60 or 70, special sign) and the 30 mph 'restricted road' limit. > > I don't mind 'type' for 'derivation', and the GB: prefix makes sense. I > believe GB is the ISO code for the UK, not necessarily restricted to Great > Britain (the British Isles minus the island of Ireland). >
So the proposal is now: maxspeed:type=GB:national_single|GB:national_dual|GB:motorway|GB:restricted My only comment is that it is a little long, but it is at least unambiguous and clear and as such I am happy to go with it. The shorthand of 'national' can therefore be translated into one of the above based on road class. Regards, Peter > -- > Steve > > > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb > >
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