What should you do when you see this road sign?

The road sign you see indicates a mandatory direction to turn left. According to German traffic regulations, when you encounter this sign, you are required to turn left at the next intersection.

This means you must prepare to signal your intent to turn left, position your vehicle accordingly in the intersection, and make the turn following any applicable traffic rules, such as yielding to pedestrians or oncoming traffic. Failing to adhere to this sign may lead to violations and affect traffic flow, hence the importance of compliance.