Which item is NOT typically part of a pre-trip inspection?

A pre-trip inspection is an essential safety procedure that helps ensure a commercial vehicle is in safe operating condition before it hits the road. The inspection typically focuses on critical safety components and systems that have a direct impact on the vehicle’s performance and the driver's ability to maintain control during operation.

The air conditioning system, while it contributes to driver comfort, is not a safety-critical component that would usually be checked during a pre-trip inspection. The primary focus of a pre-trip inspection includes evaluating essential systems like engine oil levels, brake lights, and coolant levels, all of which can significantly affect the vehicle's safety and functionality. If critical safety features or vital fluids are not at proper levels, they can lead to mechanical failures or unsafe driving conditions, which is why they are prioritized during the inspection.