Laut
https://www.region-frankfurt.de/media/custom/2629_873_1.PDF
wird der Radschnellweg gerade an der Bahn verlaufen und nicht dem bestehenden Feldweg folgen.

Haus 21a

Unable to answer "What is the house number of this building?" for way/223967327 via StreetComplete 5.2:

Schuppen der zur 52 gehört

The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI name: Soccer Halle - Mörfelden
POI types: leisure-pitch sport-soccer
OSM data version: 2018-01-26T12:04:02Z
#mapsme

"hier wurden Bürogebäude gebaut. "
The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI has no name
POI types: amenity-parking
OSM data version: 2017-10-20T12:20:02Z
#mapsme

The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI name: Tiggolino
POI types: building leisure-playground
OSM data version: 2018-05-26T22:39:02Z
#mapsme

"Neuer Kreisverkehr"
POI has no name
POI types: psurface-paved_good hwtag-nofoot hwtag-yesbicycle hwtag-yesfoot highway-tertiary
OSM data version: 2019-01-13T09:03:02Z
#mapsme

Hausnummer ist 61 H

Hausnummer ist 61 G