Why must you slow down here and be ready to brake?

You selected the correct answer. In this situation, you must slow down and be ready to brake because of the presence of a cyclist. Cyclists are vulnerable road users and can unexpectedly change direction, enter the roadway, or be hidden by parked cars. German traffic rules require drivers to drive cautiously and reduce speed when there are cyclists or other vulnerable people near the roadway, especially if the road is narrow or visibility is limited. Always be prepared to stop if necessary to protect their safety. This mindset helps you anticipate hazards and avoid accidents in urban areas.