Final answer:
Off-tracking in tractor/trailer operations is when the rear wheels of the trailer take a different path than the front wheels of the tractor when turning.
Step-by-step explanation:
Off-tracking in regards to tractor/trailer operations refers to the phenomenon where the rear wheels of the trailer take a different path than the front wheels of the tractor when making a turn. This occurs because the trailer follows a shorter turning radius compared to the tractor. As a result, the trailer's rear wheels may come into contact with curbs, other vehicles, or objects if the driver does not account for off-tracking when maneuvering.