Who has priority here?

Your answer is correct. The electric scooter has priority here.

Explanation: The yellow diamond sign indicates that you are on the main road, which means you have priority over vehicles coming from side roads. In this scenario, the electric scooter is on the main road, while the red truck is coming from a side street. Therefore, the scooter has the right of way. You must yield to the electric scooter before proceeding. This rule helps clarify who must wait at intersections where main and side roads meet. Remember, the yellow diamond without any additional signs marks the priority road in Germany.