What is the correct hand signal for a left turn?

The correct hand signal for a left turn is to extend the left arm straight out horizontally from the driver's side window. This signal is a widely recognized and standardized way for drivers to indicate their intention to turn left to others on the road, including drivers and pedestrians. Using this hand signal helps ensure that everyone is aware of your movement intention, promoting safety and clear communication while driving.

In contrast, raising the left arm upward indicates a right turn, while extending the right arm straight out signals a right turn as well. Raising the right arm upward is typically used to signal a left turn in some regions, but it is less common and can lead to confusion. Therefore, using the left arm extended straight out remains the clearest and most universally accepted method for indicating a left turn.