Only for buss !

via StreetComplete 63.1

Attached photo(s):
https://streetcomplete.app/p/345452.jpg

Unable to answer "Which direction leads upwards here?" – Steps – way/558243081 via StreetComplete 61.2:

It's a large Stairway.

it's : Oslofjord Folkehøgskole, Michelets vei 55, 1368 Stabekk
https://oslofjord.fhs.no/en/home/

the nappstraumtunnelen have been closed, but it is not closed. Strange.