Unable to answer "What’s the surface here?" – Sidewalk – osm.org/way/951491612 via StreetComplete 61.1:

It's outdoors but inside private property of the Meertalig Atheneum Woluwe.

Unable to answer "Do these traffic lights have a button to request a walk signal?" – Crossing – osm.org/node/10970887524 via StreetComplete 61.1:

There are no traffic lights there.

Unable to answer "Does this crossing have markings across the roadway?" – Crossing – osm.org/node/10970887566 via StreetComplete 61.1:

there are markings but for bikes, it is not a crossing for pedestrians