What is the purpose of using turn signals?

Using turn signals serves a crucial role in promoting safe and effective communication between drivers on the road. By signaling your intentions to turn or change lanes, you provide important information to other road users, allowing them to anticipate your movements and react accordingly. This proactive communication helps to prevent accidents and misunderstandings, facilitating smoother traffic flow.

Other options do not align with the primary purpose of turn signals. Passing a vehicle safely requires various considerations beyond just signaling, such as ensuring a safe distance and proper timing. Indicating your speed level is typically done using speedometers and is unrelated to the function of turn signals. Preventing engine failure involves mechanical measures rather than signaling other drivers. Therefore, the best description of the use of turn signals is their ability to notify others of your intentions.