Which road sign forbids you from entering the signposted area?

The first sign indicates a pedestrian zone, where only pedestrians and sometimes certain vehicles like bicycles or delivery vehicles are allowed, but regular motor vehicles are forbidden to enter. It restricts vehicle access to protect pedestrians.

The second sign is a no-entry sign, which clearly forbids all vehicles from entering the area from that direction. It indicates a one-way street or a restricted entry.

The third sign indicates priority over oncoming traffic but does not forbid entry; it instructs drivers that oncoming vehicles must yield.

Therefore, only the first and second signs forbid entering the signposted area entirely according to German traffic rules. The pedestrian zone restricts vehicle access to protect people on foot, while the no-entry sign prohibits all vehicles from entering from that direction. The third sign does not forbid entering but regulates right of way.