> In this document is a concept called "System Continuity". In few words, a > roadway of a higher classification should not connect to a single roadway of > a lower classification, so the network remains interconnected. > Do you know if this concept applies to OSM roads network also?
Motorway is purely a physical tag, so it does not necessarily follow this principle. Primary, secondary, etc. should with few exceptions, and usually do. Trunk, not so much. Most (probably) mappers in the US use it to mean "expressway", and have arbitrarily varying cutoffs for what constitutes as such, ranging from sensical (Santa Clara expressway system, CA), to not so much (this U.S. highway has gone from 5 lanes single-carriage to 4 lanes dual-carriage and thus has become a trunk; this extremely important cross-country highway slows down briefly through a small town and thus is no longer trunk). Without getting too much into my opinions about this, the majority of U.S. mappers use trunk to mean "almost a motorway but not quite", in which case you will _not_ find continuity, while some U.S. mappers use trunk to mean "most important roads that don't meet strict motorway standards", in which case you will (or at least should) find continuity. _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-us
