One more picture of a map, that highlights hiking paths, while not especially a hiking map, but the official map of the local administration. They even classify primary, secondary, tertiary by width only:
Contrasting to the ramblers club map, for them mule-tracks (Karrenweg) also available for tractors, but from looking at what is mapped as such, no guarantee from me based on my limited local knowledge. The translation to English language kind of interesting, fair weather road: That might be about surface? But the rest of terms all about width.
PS: Although not on the legend, their map shows signature “Traces” from legend mentioned above: Where width cannot be told at all, because insufficient trampling to form a path and no markers present.