Hi,

the qualitiy of the road is already described by surface=asphalt + tracktype=grade1
You can refine it further by specifying smoothness or width

The highway tag specifies the type and purpose of the way, although the distinction is not always so clear, see also https://wiki.openstreetmap.org/wiki/DE:Tag:highway%3Dunclassified#Abgrenzung_von_highway=unclassified_und_highway=service_und_highway=track_tracktype=grade1

Teichwiesenweg is open to the public to access the driver school course. All the other tracks are intended for agricultural use and cyclists only.
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            Published using OSMCha: https://osmcha.org/changesets/148158308
            