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You arrive at an intersection with this signal. Can you turn left here?

A Yes, this is a "protected" turn.

The red light stops vehicles from proceeding straight through the intersection, while the green arrow allows vehicles to turn left. This is a "protected" turn; oncoming traffic is stopped at a red light while the green arrow is lit for you. However, you must still yield to any vehicles already in the intersection and any crossing pedestrians before you turn. [Green Arrow, Traffic Control Signals, Chapter 3 – Pavement Markings, Traffic Signs, Lights, and Signals, Missouri DOR Driver Guide]