Why is it dangerous to overtake in this situation?

Your answer is fully correct. It is dangerous to overtake in this situation for these reasons:

1. Vehicles ahead might suddenly swerve or change lane, which creates an unpredictable hazard for overtaking.
2. Limited visibility means you cannot see far enough ahead on the road to safely judge if overtaking is possible without risking a collision with oncoming traffic or obstacles.
3. There is insufficient space to return safely to your lane between the vehicles in front, increasing the risk of sideswiping or causing a collision.

According to German traffic rules, overtaking is only safe when you have a clear view ahead (so you can see enough distance for the entire overtaking maneuver), when no vehicles or obstacles ahead pose sudden risks, and when you have enough space to pull back safely into your lane without cutting off other road users. If these conditions are not met, overtaking is considered dangerous and prohibited to prevent accidents. Always prioritize safety and caution over impatience when overtaking, especially on two-lane rural roads.