Why are you not allowed to overtake here?

In the presented scenario, overtaking is not allowed because of two main reasons.

Firstly, the side clearance to cyclists is too small. This is crucial for ensuring the safety of cyclists. Under German traffic laws, when overtaking cyclists, a sufficient distance must be maintained to avoid endangering them.

Secondly, you may endanger oncoming traffic. If the road ahead is not clear, overtaking could lead to collisions with vehicles coming from the opposite direction. It's important to maintain safety both for cyclists and for other road users.

Considering both reasons is necessary to uphold traffic safety regulations and avoid accidents. Always ensure there is enough space and clear visibility when considering an overtaking maneuver.