What is the function of a brake light?

The function of a brake light is primarily to signal to other drivers when the vehicle is slowing down or coming to a stop. This is critical for road safety because it allows drivers behind the vehicle to anticipate the need to slow down or stop themselves, reducing the risk of rear-end collisions. When the brake pedal is pressed, the brake lights illuminate, providing clear and immediate feedback to other road users about the driver's actions.

The other options pertain to different vehicle functions and do not accurately describe the specific purpose of brake lights. For instance, while a malfunction indicator does serve to alert drivers to issues with a vehicle, it does not specifically convey information about braking. Similarly, while vehicle illumination is essential for night driving, this is typically the role of headlights rather than brake lights. Lastly, indicating that the vehicle is in park does not relate to the function of brake lights, as this is managed by indicators on the dashboard. Understanding the specific role of brake lights helps reinforce safe driving practices and awareness on the road.