Why are you required to stop here?

You are required to stop because pedestrians intend to cross the road from either side (left and right). According to German traffic rules, drivers must yield and stop for pedestrians waiting to cross at pedestrian crossings or where it is obvious that they want to cross. This ensures pedestrian safety by giving them priority while crossing the street. The presence of pedestrians on both sides increases the need for a full stop to allow them to cross safely. Cyclists crossing from the left do not require stopping in this specific scenario unless they are also using a designated crossing, but for pedestrians, stopping is obligatory.