Thanks, I (or some other local) will take another look once road works are finished (seems to be nearly done).

Some more info on this project:
 https://sitzungsdienst-hamburg-mitte.hamburg.de/bi/vo020.asp?VOLFDNR=1012560
https://fragdenstaat.de/anfrage/fahrradfreigabe-zwischen-buchheisterstrae-und-rodamm/