In the location's words:

Whether for the weekend or the whole week: the Hastedt weekly market on the corner of Bei den drei Pfählen and Hermine-Berthold-Straße has everything you need for good regional and fresh shopping: fruit and vegetables in conventional or organic quality, sausage and meat, flowers and plants, fish, poultry, cheese and much more.

The Hastedt weekly market is located almost exactly on the transition from the Östliche Vorstadt to Hastedt.
This explains the street name Bei den Drei Pfählen, which is a reminder of the former border between the city of Bremen and the village of Hastedt.