What is the function of turn signals in a vehicle?

Turn signals play a critical role in road safety by indicating a driver's intentions to other road users. When a driver activates their turn signal, it communicates their intention to change direction, whether that be turning left or right or changing lanes. This allows other drivers, cyclists, and pedestrians to anticipate the movement of the vehicle and react accordingly, helping to reduce the risk of accidents.

The effectiveness of turn signals is heightened when they are used correctly and in a timely manner. For instance, signaling before making a turn or merging gives other drivers sufficient time to adjust their speed or position on the road, maintaining a smoother flow of traffic. Additionally, in a driving environment where various users, such as cyclists and pedestrians, are present, turn signals serve as an essential tool for ensuring everyone’s safety by clearly conveying a driver's intentions.

The other options, while they describe aspects of a vehicle's features or other safety measures, do not directly relate to the primary purpose of turn signals. For example, the color of the car and visibility in fog are unrelated to the communicative purpose of turn signals, and alerting pedestrians is a more general safety consideration not specifically aligned with the function of signaling a turn.