What is checked with the brake lights during the inspection?

During the pre-trip inspection, it is essential to check the brake lights to ensure they are functioning properly. When pressing the service brake, the brake lights should illuminate to signal to other drivers that the vehicle is slowing down or stopping. This functionality is a critical safety feature, as it communicates the driver's intentions on the road, helping to prevent collisions.

The other choices do not accurately describe the standard checking procedure for brake lights during an inspection. For instance, brake lights should not turn on when the ignition is off or flash continuously. Additionally, they should not change color, as brake lights are designed to consistently display a specific color (usually red) when activated. Ensuring that the brake lights operate correctly when the service brake is applied is crucial for the safety of both the driver and other road users.