My first try finding a spot to the A27 (-> Hannover) and I got a bit lucky, I guess. At both of the petrolstations weren't many cars and most of them locals or heading in the direction of Osterholz-Scharmbeck/Bremerhaven. I So I made a sign and stood short behind the traffic lights because most of the cars beginning to speed up

Got a lift directly to Bremerhaven after 20 minutes.

Service area Goldbach Direction Bremen, Bremerhaven, Cuxhaven