When is it permissible to carry an additional person on the forklift?

The correct answer highlights the importance of safety regulations regarding the operation of forklifts. It underscores the fact that forklifts are specifically engineered for particular loads and uses, and their design dictates how they can be operated safely. If a forklift is designed to carry an additional person, it will typically include features such as a second seat and proper safety restraints designed for passenger use. Operating equipment in a manner consistent with its design helps ensure the safety of all personnel involved.

Carrying additional individuals on a forklift when it is not designed for that purpose can create significant safety risks, including the potential for accidents or instability of the load being carried. This is why it is critical to adhere to the manufacturer’s specifications and industry regulations to maintain a safe working environment.

The other options reflect scenarios that might seem plausible but do not align with safety guidelines. A large enough seat does not guarantee safety if the forklift isn't designed for multiple riders. Supervisor permission does not replace the necessity for equipment to be manufactured for such use. Lastly, relying on a spotter to walk rather than adhering to safety designs can lead to dangerous situations, especially in busy work environments. Thus, it is essential always to prioritize operating protocols and equipment design when deciding on passenger safety and compliance.