You want to turn left. Which line should you steer?

Your answer is correct. When you want to turn left in a multi-lane road, you should steer along the middle driving line, which positions your vehicle correctly for the turn.

This is because the middle line allows you to make a smooth and safe left turn without crossing other lanes unnecessarily. Steering too far left or right could cause you to interfere with traffic going straight or turning right.

In German traffic rules, it's important to choose the lane that aligns with your intended direction early enough before the turn, so other road users can anticipate your movement. Here, the middle lane is that proper lane for a left turn.