Which of the following is NOT required in a pre-trip inspection?

In a pre-trip inspection, the focus is primarily on safety and determining whether the vehicle is in a roadworthy condition. Checking the oil level, inspecting the brake lights, and examining the tires are all crucial components of this inspection. These checks help ensure that the vehicle operates safely and efficiently, minimizing the risk of breakdowns or accidents while on the road.

Testing the air conditioning, while important for comfort and creating a pleasant driving environment, is not considered a critical safety issue. The absence of air conditioning may not affect the fundamental operational safety of the vehicle. Therefore, it is not a mandated part of the pre-trip inspection being aimed at essential safety elements. This is why testing the air conditioning is the correct answer to the question about what is not required in a pre-trip inspection.