What is the proper hand signal for a left turn?

The proper hand signal for a left turn is to extend your left arm straight out. This signal is universally recognized among drivers and cyclists to indicate the intention to turn left. It provides clear visual communication to other road users about the driver's intended direction, helping to enhance road safety.

When the left arm is fully extended perpendicular to the vehicle, it is distinctly visible to those around the driver, including drivers in other vehicles, pedestrians, and cyclists. This is particularly important since not all vehicles are equipped with turn signals, so using hand signals helps convey the driver's actions more effectively.

Other options, such as extending the right arm or raising the left arm at a 90-degree angle, correspond to different movements or actions, which can lead to confusion on the road. Making a circular motion with the arm does not represent any conventional signaling and could mislead other drivers. Therefore, using the left arm extended straight out is the most appropriate and widely accepted signal for a left turn.