What is the main purpose of using turn signals?

The main purpose of using turn signals is to alert other drivers of your intentions. This essential aspect of safe driving communication ensures that other road users are informed of your next movements, whether you are turning, changing lanes, or merging. By using turn signals, you provide critical information that helps prevent accidents, as other drivers can anticipate your actions and adjust accordingly. This form of communication fosters a safer driving environment and enhances overall road safety for everyone involved.

The other options do not serve this crucial function. Indicating frustration or communicating only with pedestrians is not a valid use of turn signals, as they are primarily designed for other drivers. Signaling the end of a journey is also not a practical application of turn signals in regular traffic scenarios.