Why is it dangerous to overtake in this situation?

In this scenario, all three reasons given are correct and important for understanding why overtaking is dangerous.

First, vehicles ahead may suddenly move out to overtake themselves or avoid something, making their actions unpredictable. Second, you cannot see far enough ahead to be sure that the road is clear for the whole overtaking process, which is especially risky on rural roads where speeds are high and oncoming traffic might appear suddenly. Third, there is not enough space between the vehicles in front of you to safely pull back in if an unexpected situation arises, such as oncoming traffic or the car in front braking.

According to German traffic rules, overtaking is only allowed when it is clear, you have a good view of the road ahead, and enough space to overtake and return safely. All three factors must be checked to avoid accidents. Always ensure overtaking is safe by considering possible actions by other drivers, visibility, and available space.