When is it necessary to use turn signals while driving?

Using turn signals is crucial for safe driving and is required in specific situations to communicate your intentions to other road users. The correct answer highlights the importance of using turn signals not only when changing lanes but also when turning or merging. This practice enhances safety by alerting other drivers, cyclists, and pedestrians about your movements, which can prevent accidents.

When changing lanes, signaling indicates to other drivers that you plan to move into a different lane, giving them time to adjust their speed or position. Similarly, when turning at intersections, it informs everyone of your planned direction, allowing other vehicles and pedestrians to react accordingly. Merging onto highways or into traffic also requires signaling to help ensure that everybody understands your actions, making the process smoother and safer.

The other options do not encompass the full scope of when signaling is necessary, as they either limit it to a specific scenario or suggest that signaling is not needed under certain conditions, which does not align with safe driving practices. Proper use of turn signals is vital irrespective of speed or location, underscoring their role in promoting road safety and effective communication while driving.