[Tagging] Roads with no speed limits

Martin Koppenhoefer dieterdreist at gmail.com
Sat Sep 3 14:39:30 UTC 2016

2016-09-03 15:57 GMT+02:00 Colin Smale <colin.smale at 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.


[1] management summary on WP-de, the original texts are copyrighted:
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