This bridge over the train tracks is being repaired/replaced, so this whole stretch of road, from this marker to right before Lenglernerstr. (west of the marker) is blocked. The city says it will remain so until probably the end of 2027.
Info from the city (in German): https://www.goettingen.de/portal/meldungen/verkehrseinschraenkung-auf-der-b27-noerdliche-bruecke-gesperrt-900004612-25480.html?rubrik=900000003

Map from the city: https://stadtplan.goettingen.de/Goettingen/client/gisclient/index.html?&applicationId=1105