You want to turn left. When must you pay attention to the traffic following behind you?

When you want to turn left, it's crucial to pay attention to traffic behind you both before selecting the appropriate lane and before executing the turn.

1. Before selecting the appropriate lane: It's important to ensure that it is safe to change lanes and that no vehicles are approaching from behind that might influence your lane change.

2. Before taking the turn: You need to check for any vehicles or cyclists that may be close behind you, as they could be at risk of collision if you slow down or stop suddenly to make your turn.

Both of these moments require your attention to ensure a safe maneuver, in accordance with German traffic rules that emphasize the need for awareness of surrounding traffic before and during a turn.