Which of the following is true about a green arrow pointing left?

At a green arrow, you can safely turn in the direction of the arrow. This is a "protected" turn; oncoming traffic is stopped at a red light while the green arrow is lit. However, you should always be prepared for the unexpected (such as an oncoming vehicle that illegally runs the red light). [Intersection Gridlock, Chapter 5 Signs, Signals, and Pavement Markings, Minnesota Driver's Manual]