Unable to answer "What’s the weight limit here?" – on bridge: Service Road – https://osm.org/way/751281526 via StreetComplete 62.1:

Für Radfahrer und Fußgänger. Kein Schild vorhanden

Attached photo(s):
https://streetcomplete.app/p/321518.jpg
https://streetcomplete.app/p/321519.jpg