What does this traffic sign combination indicate?

The traffic sign combination you see indicates that you are approaching an area where there are tram tracks. The triangular sign alerts you to the presence of trams, while the circular sign indicates a maximum speed limit of 10 km/h.

When you select both options indicating that you may approach and cross the tracks at a maximum speed of 10 km/h, you acknowledge the importance of reducing speed for safety. This is crucial because trams can appear suddenly, and slower speeds allow for better reaction times.

In summary, both parts of your answer are correct and necessary for ensuring the safety of both drivers and tram passengers in this scenario according to German traffic regulations.