On Thu, December 8, 2011 09:20, Richard Fairhurst wrote: > Andrew Errington wrote: > >> I don't know for sure, but I expect that the initial list of road >> classifications were derived from UK Ordnance Survey classifications: >> > > Yes. > > >> Motorway - motorway >> B road - secondary >> 'yellow' road - tertiary >> 'white' road - unclassified >> > > Pretty much, yes. tertiary/unclassified isn't a hard and fast rule. > > >> dual-carriageway - trunk A road - primary >> > > Not quite: > "primary A road (green signs)" -> trunk > "non-primary A road (white signs)" -> primary > > >> upgraded A road - primary + motorroad > > Not really used in the UK. I think that was introduced in Germany. > (Personally I think that was a good decision by the German mappers and I'd > like to see other countries do something similar, albeit co-ordinated > with other nations, rather than always trying to shoehorn in incompatible > systems to the UK-derived classification.)
I thoroughly agree, but it's difficult to introduce a new classification, describe its meaning, and get agreement from renderers to render it in the right way (even if it renders the same as another road class it still needs to be specified somewhere). If it's possible to match local road classification to the existing OSM model then that's a Good Thing. In Korea, I felt it was actually quite easy to do this[1]. Unfortunately someone else came up with a different scheme before me that doesn't actually capture the differences. Since then I have been encouraging everyone to consider my suggestions. What I'd really like is for Mapnik to render the road symbols in the same way as Korean road signs (red/blue shield, blue oval, white octagon, yellow rectangle) but it seems like a trivial request and Mapnik authors have more important things to do. Best wishes, Andrew [1] http://wiki.openstreetmap.org/wiki/Korea_Road_Classification _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
