What is the right course of action here?

The correct action is to not overtake the cyclist at this moment. According to German traffic rules, you should only overtake a cyclist when it can be done safely, maintaining a minimum passing distance of 1.5 meters in urban areas. If there isn’t enough space or visibility to safely pass, you must wait and not attempt to overtake.

Sounding your horn to urge the cyclist to keep right is not appropriate, as it can startle the cyclist and create a dangerous situation. Patience and safety take priority. Waiting shows good judgment and respect for vulnerable road users.

In summary, always ensure you have enough space and clear conditions to overtake cyclists safely. If not, wait calmly behind them until it’s safe to pass. This approach protects everyone on the road.