What is the proper hand signal for a left turn?

The proper hand signal for a left turn is to extend the left arm straight out. This is a universally recognized signal that communicates to other road users your intention to turn left. When you extend your left arm horizontally from the driver's side window, it clearly indicates that you are making a left turn, which helps ensure that other drivers, cyclists, and pedestrians are aware of your intended movement.

Using the left arm in this manner is particularly important in scenarios where turn signals or brake lights may be less visible, or when you need to reinforce your intentions with a physical signal. Understanding and using hand signals properly is crucial for safe driving practices and enhances communication on the road.