Hi, 
I have added road closure based on internal driver feedback and (https://www.strassenbau.niedersachsen.de/startseite/projekte/bundesstrassen/fahrbahnsanierung-zwischen-bremervorde-und-elm-im-zuge-der-bundesstrasse-74-186888.html). Since, I am not aware of the exact opening date of the road, I have not added any expected opening date. If any local mapper has any information regarding the road closure at this place, please tag it accordingly or please let me know. I will make the edits.
Thanks,
mundlk.