UK Driving Theory Practice Exam 2025 – All-in-One Guide to Pass Your Test with Confidence!

The function of the brake lights is to warn drivers behind you that you are slowing down. When the brake pedal is pressed, the brake lights illuminate, clearly indicating to other road users that the vehicle is reducing speed or stopping. This is crucial for maintaining safety on the road, as it allows following vehicles to anticipate your actions and respond accordingly, helping to prevent rear-end collisions.

Other options describe different functions or signals that are not related to the purpose of the brake lights. For example, reducing fuel consumption can be relevant to vehicle operation but does not pertain to the function of the brake lights. Indicating when turning is specifically the role of indicator lights, and signaling when parked pertains to hazard lights or parking lights, which serve entirely different purposes. Therefore, the correct answer emphasizes the vital warning function that brake lights provide, enhancing road safety by communicating your vehicle's activity to those behind you.