When is it necessary to use your turn signals in Arizona?

Using turn signals is crucial for safety and communication on the road. In Arizona, it is necessary to use your turn signals when changing lanes, turning, or merging. This requirement ensures that other drivers are aware of your intentions, allowing them to react appropriately, which can prevent accidents and promote smoother traffic flow.

When changing lanes, signaling alerts drivers behind and beside you that you are about to move into their space, which is essential for their awareness and safety. Similarly, when turning, indicating your direction lets other road users—including pedestrians—know your plans, helping to avoid confusion and potential collisions. Merging requires signaled communication as well, especially in situations with high-speed traffic, to give others time to adjust their speed and positions.

The other choices presented do not encompass the full scope of situations in which signaling is required. For instance, only signaling when turning does not cover changing lanes or merging, which are equally important for maintaining safe driving practices. Additionally, only signaling when merging onto highways overlooks situations where lane changes may occur even on regular roads. Lastly, while signaling when entering roundabouts is important, it is not the only situation that requires signaling; therefore, it does not capture the complete set of circumstances outlined in the correct answer.