What is the function of the brake lights?

Answer: B — To alert drivers behind you that you are slowing down or stopping

Brake lights serve a crucial function in road safety by alerting drivers behind a vehicle that the vehicle is slowing down or coming to a stop. This is vital because it helps to prevent rear-end collisions. When the driver applies the brakes, the brake lights illuminate, providing a clear signal to following drivers that they should also slow down or prepare to stop. This function is especially important in conditions where visibility may be compromised, such as at night or during inclement weather. The other functions listed, while important in their own contexts, do not pertain to the specific role of brake lights. For instance, brake lights do not indicate acceleration, provide nighttime illumination, or signal maintenance needs. Their primary and distinct purpose is to ensure that other road users are aware of changes in the speed of the vehicle in front of them, thereby enhancing safety on the road.