What do you have to be aware of with this traffic sign?

This traffic sign is a mandatory direction sign in Germany, which means you must only go in the direction indicated—in this case, a left turn. Because you are required to make a left turn, you must also signal this intention to other road users by using your left turn indicator. Signaling helps ensure safety by informing others of your intended movement. Therefore, ignoring the signal or turning in a different direction would be against the traffic rules. The combination of signaling and obeying the directional instruction is essential when you see this sign.