Unable to answer "What diameter is specified on the sign for this fire hydrant?" – Underground Fire Hydrant – node/9751684671 via StreetComplete 61.3:

Instead of hydrant signage, i found some weird Ferngas signage from MVV there.
But the hydrant certainly exists.
There's even another hydrant on the bike path on the opposite side of the road

Unable to answer "What’s the measured height below the bridge?" – Industriestraße [K 4160] (Secondary Road) – way/1420923789 via StreetComplete 61.3:

There's no bridge here

Hydrant here

via StreetComplete 61.3

Attached photo(s):
https://streetcomplete.app/p/302238.jpg
https://streetcomplete.app/p/302239.jpg

Unable to answer "How is this power line attached?" – Power Pole – node/1987575497 via StreetComplete 61.3:

Catenary, not electric pole

Start section of sidewalk that leads up to the wheelchair ramp up to the arcades

via StreetComplete 61.3

GPS Trace: @BFritz0815/traces/12055519

Unable to answer "How is this power line attached?" – Power Pole – node/1987575374 via StreetComplete 61.3:

Not a power line. Is a catenary mast

Currently no passage due to a construction site

via StreetComplete 61.3

Unable to answer "What is the width of the opening here?" – Gate – node/5621928427 via StreetComplete 61.3:

Is entrance to private property. Has a 1 step threshold at the street side with a gate at the threshold, followed after 2m by a set of stairs, 2m widewith 2 steps.
After that there is an entrance with a threshold step on the right. Straight ahead is a set of stairs 2,5m wide with handrail and over a dozen steps.
Nothing there is wheelchair accessible

Unable to answer "Is this still here?" – Dienstmann Muck (Information Board) – node/2378463199 via StreetComplete 61.3:

Temporarily at the front entrance in front of the bundespolizei entrance