Keizou Wakabayashi
Unable to answer "What surface does this piece of road have?" for https://osm.org/way/421190772 via StreetComplete 31.3:

Culvert

Japanese "暗渠"

Attached photo(s):
https://westnordost.de/p/41219.jpg
https://westnordost.de/p/41220.jpg
https://westnordost.de/p/41221.jpg