When should a driver use their turn signal?

Answer: C — At least 100 feet before turning or changing lanes

Using a turn signal is an essential aspect of safe driving, as it communicates to other road users your intention to turn or change lanes. The correct choice is that a driver should use their turn signal at least 100 feet before turning or changing lanes. This distance allows adequate time for other drivers and pedestrians to notice your intention and act accordingly, helping to prevent accidents. This practice is crucial, particularly in busy traffic conditions where drivers need to anticipate movements well in advance. By signaling properly, a driver not only complies with traffic laws but also contributes to a more predictable and safer driving environment for everyone on the road. The requirement to signal well ahead of a lane change or turn ensures that all road users are informed and can adjust their actions accordingly, fostering a culture of communication among drivers.