What do you have to be aware of when you see this traffic sign combination?

You are correct to focus on signaling left when following the priority road at this intersection. The yellow diamond sign indicates that you are on a priority road, meaning you have the right of way. The smaller sign below shows the layout of the intersection and that the road to the left is a side road joining the priority road.

According to German traffic rules, when you turn off a priority road, you must signal your turn clearly to inform other drivers. In this case, turning left off the priority road requires a left-turn signal. If you continue straight on the priority road, you do not need to signal because you are not turning or leaving the priority road.

The other options are incorrect because:
- Continuing straight ahead on the priority road does not require signaling a right turn.
- The sign does not prescribe traffic direction to the left; it just shows the intersection layout and the priority road's path.

In summary, the rule is: When driving on a priority road, always signal when you turn off it, but not when you continue straight.