Final answer:
The ignition key should be in the 'off' position during a pre-trip inspection to allow for a proper safety check of the vehicle.
Step-by-step explanation:
During your pre-trip inspection, you should ensure that your ignition key is in the 'off' position, or as some may refer to it, the 'lock' position. This is important so that all systems are off, allowing you to inspect the vehicle without any interference from the engine or other electrical systems. An inspection is a critical safety measure to ensure that the vehicle is in proper working order before operation.