Unable to answer "What surface does this piece of road have?" – Service Road – https://osm.org/way/942060707 via StreetComplete 57.4:

There are two adjacent small private roads not sure to which one this road on the map refers

Attached photo(s):
https://westnordost.de/p/213789.jpg
https://westnordost.de/p/213790.jpg
https://westnordost.de/p/213791.jpg