What feature protects the operator's head during forklift operation?

The feature that protects the operator's head during forklift operation is the overhead guard. This component is a crucial safety design element on forklifts, which is purpose-built to shield the operator from falling objects or debris that may occur in the workplace. It helps to provide a safer operating environment, particularly in areas where heavy items are being moved or stored overhead, significantly reducing the risk of injury to the driver in the event of an accident.

While the other items listed may contribute to safety, they serve different functions. The load guard is typically used to mitigate load shifting during transport, seat belts help secure the operator in the vehicle during operation, and safety helmets provide additional protection for the head but are not an inherent part of the forklift's design. Therefore, the overhead guard stands out as the specific feature designed for the protection of the operator's head.