Which of the following actions is NOT part of a standard pre-trip inspection?

Confirming the cleanliness of the cab is not typically considered part of a standard pre-trip inspection. The primary focus of a pre-trip inspection is to ensure the vehicle is safe and operational before hitting the road. Key areas of concern include checking tire pressure, inspecting for fluid leaks, and testing vehicle lights. These actions directly impact vehicle safety and performance.

While a clean cab can contribute to overall comfort and professionalism, it does not influence the mechanical operation or safety of the vehicle. Therefore, it is not included in the critical safety checks that are prioritized during a pre-trip inspection. The other actions listed, such as checking tire pressure and testing lights, are imperative to the vehicle's functionality and roadworthiness.