2016-09-03 15:57 GMT+02:00 Colin Smale <colin.sm...@xs4all.nl>: > That will only work if the road types are mapped correctly to their > official legal status, and not to how they appear.
There not the one "legal status", at least not in Germany. There's the maintainer of the road, e.g. "Bund", "Land", "Kommune" (national, federal, comunal), and this is how road numbering works. This is the most visible legal status, but it doesn't allow to deduct specific speed limits. Then there is the road class according to technical specifications, consisting of 3 functional classes (connective, distribution, residential), 5 "category groups" (A, B, C, D, E) that have to do with the aforementioned functions and the context (inside and outside built-up areas, lined with buildings and not) and there are 6 levels of connectivity (or importance of connection). These are defined in the 1988 RAS-N (Richtlinien für die Anlage von Straßen – Netzgestaltung), [1], which is now obsolete, but according to which many of the current roads have been planned and built. They have been superseeded by the RIN (Richtlinien für die integrierte Netzgestaltung) [2] which are somehow similar in content, at least for this discussion here. These technical rules are the actual important classes / legal status, that would have to be known, but not even their existence is commonly known, they're stuff for civil engineers. Laws and rules are typically limited to national borders, if we were to structure OSM according to them, we would not have the nice global dataset we all love, we would have a collection of fragmented national solutions, incompatible between them. Cheers, Martin ____ [1] management summary on WP-de, the original texts are copyrighted: https://de.wikipedia.org/wiki/Richtlinien_f%C3%BCr_die_Anlage_von_Stra%C3%9Fen_%E2%80%93_Netzgestaltung [2] https://de.wikipedia.org/wiki/Richtlinien_f%C3%BCr_integrierte_Netzgestaltung
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