2012/7/21 David ``Smith'' <vidthe...@gmail.com>: > public parks, and on many trucks and railcars. On the other hand, I'd never > heard of a "trunk road" before joining OSM. I still don't know any > objective way to tell the difference between trunk, primary, secondary, > tertiary, and unclassified roads
The basic idea is that of a hierarchic grid, where primary are the principal "ordinary" roads (those that do not have slip ramps but crossings), usually connecting the bigger cities and towns or other very important places , secondary are "one step in hierarchy below" primaries and tertiary roads are even less in the hierarchy, least of all connection roads are "unclassified" roads. You will get a feeling for what is a primary and what is a secondary or tertiary road if you look at the traffic flow in an area. You can often see from crossings which road is the more important one. Trunk roads don't exist in Italy or Germany either as official classification (at least not with this term). They are roads that do have slip ramps but are not motorways and usually do not have traffic light controlled intersections or ordinary intersections (with maybe the exception of service roads) (that's what we use them for in Italy and Germany). cheers, Martin _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
