Why do you have to pay particular attention now?

Your answer is fully correct. You need to pay particular attention for these three reasons based on German traffic rules and safe driving practice:

1. If there is traffic backed up on the road you intend to turn into, you must be prepared to stop and not block the intersection. This prevents traffic congestion and ensures safety for all road users.

2. Large vehicles like trucks turn more slowly and with wider arcs. Being aware of this helps you maintain a safe distance and avoid collisions or impeding the truck’s turn.

3. Approaching traffic lights require attention because they can change to red, mandating you to stop. Anticipating this allows you to slow down smoothly and avoid sudden braking.

Together, these points emphasize the importance of vigilance, anticipation, and adapting your driving to the road and traffic conditions ahead, which is crucial for safe driving in Germany.