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

In German traffic rules, you must pay attention to the traffic behind you in two key moments when turning left: first, before selecting the appropriate lane, and second, before actually making the turn. Checking behind before changing lanes ensures you do not cut off or endanger other road users. Then, just before turning, it is important to check again to see if any vehicles or bicycles are close or trying to overtake. Waiting until after the turn is too late, as you might cause an accident or force others to brake suddenly. So, these two checks help ensure safety and smooth traffic flow during your left turn.