Which behavior is considered a failure in signaling?

Not using a turn signal when changing lanes is a clear example of a failure in signaling because it directly impacts communication between drivers on the road. Turn signals are essential for indicating a driver's intent to change direction, which helps to prevent accidents by allowing other road users to anticipate and react appropriately. When a driver fails to signal, other drivers may not understand their intentions, leading to confusion and potential collisions.

In contrast, responding to another driver's turn signal demonstrates an understanding of and adherence to proper signaling practices, thus enhancing road safety. Using turn signals in well-lit conditions is also appropriate behavior; turn signals should be used regardless of light conditions to ensure visibility of intentions. Furthermore, signaling to alert pedestrians is another responsible action that fosters safety, highlighting the importance of clear communication in all driving situations.