What should you do when you see this road sign?

This sign is a mandatory direction sign in Germany, meaning you must follow the indicated direction—in this case, left.

You must signal (indicate) left early enough to inform other road users of your intention. Then, you should make the turn to the left before passing the sign itself, not after it.

Turning left behind the sign is incorrect because the sign marks the point where the turn must begin or be completed safely. This ensures smooth traffic flow and compliance with road regulations.

Remember: When you see such a blue circular sign with an arrow, it mandates the direction you must take immediately at or just before the sign, and you must signal your intended turn in advance.