What must you be prepared for here?

In this scenario, there are several important considerations for driving safely, especially under the conditions depicted (rain and potential slippery roads).

1. **Vehicle from the Right**: There's a risk of encountering vehicles coming from the right, which is particularly critical at intersections. Drivers must always be attentive and yield as required, as vehicles from the right have the right of way unless otherwise indicated.

2. **Extended Braking Distance**: Wet roads increase the stopping distance required. Drivers need to adapt their speed and maintain an appropriate distance from the vehicle in front of them to allow for longer braking times.

3. **Narrowed Carriageway**: The presence of obstacles, such as standing water or debris, can lead to a narrowed carriageway. This requires extra caution to ensure safe navigation around these obstacles.

Understanding and preparing for all these factors is essential for safe driving in adverse weather conditions, aligning with German traffic regulations focused on precaution and road safety.