What is correct in this situation?

The sign you see is a warning for an upcoming intersection where the "right-before-left" rule applies. This means that when you approach this intersection, you must give way to vehicles coming from your right. This rule is standard in Germany wherever there are no traffic lights or priority signs.

In this situation, you need to be particularly attentive to vehicles coming from the right and only proceed when it is safe. This rule helps ensure fair and predictable priority at intersections without additional traffic control devices.

Your correct understanding of the "right-before-left" rule is essential for safe and lawful driving in Germany.