What is the main purpose of using turn signals?

The main purpose of using turn signals is to let other drivers know your intention to turn or change lanes. This is crucial for maintaining safe driving conditions and enabling other road users to anticipate your actions. By signaling your intentions, you communicate important information about your upcoming maneuvers, which helps prevent accidents. Proper use of turn signals contributes to overall roadway safety by creating a predictable driving environment.

In the context of the other options, while alerting pedestrians, indicating speed, and warning of traffic can be important aspects of driving, they do not capture the primary function of turn signals. The focus of turn signals is specifically on informing other drivers about your directional changes, making it a critical tool for effective communication on the road.