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Question:

You arrive at a crossroads. You need to turn left and you have a green light. Can you proceed?

A Yes, one vehicle can turn left at a time after yielding to all pedestrians and traffic.
Explaination

You can turn left on a green signal, but you must yield to all vehicles and pedestrians entering the intersection because they have the right-of-way. Only one vehicle can enter the intersection to turn left at a time. [Turning Through an Intersection, Traffic Signals, Chapter 4: Traffic Signs and Signals, Indiana Driver's Manual]