Hi, thank you for for the info. You are right there is a one-way sign for the first part. But it is only for this way: https://www.openstreetmap.org/way/147516022 If you enter from the other direction you can drive this road (https://www.openstreetmap.org/way/300285807) until the no entry sign (the place where I put the node).
Right now there is some construction and it might be changed again, because of the renewing of the train station. I will have a closer look on this are in a few weeks. I update the first part of the road now.