What should a driver inspect for proper functioning during a pre-trip inspection regarding lights?

During a pre-trip inspection, it is crucial for a driver to ensure that all critical lighting systems on the vehicle are functional. This includes checking that turn signals and brake lights are operational. Proper functioning of these lights is essential for safe driving and communication with other road users.

Turn signals play a vital role in indicating lane changes and turns, and brake lights are equally important as they alert drivers behind you when you are slowing down or stopping. Ensuring these lights are operational helps prevent accidents and enhances safety on the road.

While checking the cleanliness of headlights, the illumination of reverse lights, and the functionality of rear fog lights are also important (as they contribute to overall safety and visibility), the operational status of turn signals and brake lights has a direct and immediate impact on the driver's ability to communicate intentions to others on the road. Therefore, option B is the most critical aspect of light inspection during a pre-trip check.