What do you have to be aware of in this traffic situation?

In the given traffic situation, it is crucial to adhere to the lane markings. The correct understanding includes recognizing that:

1. Not crossing the lane marking is essential for maintaining safety and preventing potential collisions.
2. Crossing the lane marking to overtake is permissible only if it can be done safely and under appropriate conditions.
3. It is not allowed to cross the lane marking if oncoming traffic is present, as this poses significant risks.

The combination of answers emphasizes the importance of safe driving practices according to German traffic laws, ensuring that all actions taken on the road are considerate of other road users and follow traffic regulations. Knowing when and how to safely change lanes or overtake is vital for road safety.