What is a common hand signal used by cyclists to indicate a left turn?

The hand signal that is commonly used by cyclists to indicate a left turn is the left arm extended horizontally. This signal is widely recognized and is part of the standard hand signals for cyclists. By extending the left arm parallel to the ground, the cyclist clearly communicates their intention to other road users, including drivers and pedestrians, that they will be making a left turn. This is crucial for ensuring safety and reducing the risk of accidents, as it allows others to anticipate the cyclist's movement.

While other signals, such as raising the left arm upward or using the right arm, may be used in different contexts or areas, the standard practice for indicating a left turn is the horizontal left arm signal. This consistency is important for maintaining clear communication on the road, enabling everyone to understand the cyclist's intended actions.