How can you indicate your intent to turn left?

Using your left turn signal to indicate your intent to turn left is the correct choice because it communicates your plans clearly and effectively to other drivers and pedestrians. Turn signals are specifically designed for this purpose, allowing others to anticipate your actions and react accordingly, which enhances safety on the road.

Preparing to stop is also important, as it indicates to other drivers that you are reducing speed and preparing for the turn. This further ensures that all road users are aware of your intentions and can make informed decisions. Signaling not only helps in preventing accidents but also adheres to traffic laws, making it a responsible action when changing direction.

The other methods listed, such as using the right turn signal or honking the horn, do not appropriately convey your intent to turn left. Waving your hand out of the window is less formal and not universally understood as a signal for turning, making it a less effective communication method in traffic scenarios.