NVDB
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Sweden
This is an acronym for "Nationella Väg DataBasen" a swedish road database, read more at: https://www.trafikverket.se/tjanster/system-och-verktyg/data/Nationell-vagdatabas/
It is available as "Trafikverket Road Network" in both iD and JOSM and can freely be used to draw from.
There is an manual import project going on if you want to help: Import/Catalogue/Sweden highway import
Speedlimit colors
Definition of the colors using the Map Paint Styles "Maxspeed" in JOSM. Source
Suggested source tag
Norway
In Norway NVDB is "Nasjonal vegdatabank". https://www.vegvesen.no/fag/teknologi/nasjonal-vegdatabank/
Some elements in OSM will have a nvdb:id that corresponds to the NDVB database. This aids in updating some values for the element.