Which of the following is NOT one of the three main superimposed loads to consider?

The weight of the operator is not considered one of the three main superimposed loads when evaluating the stability and safety of hoisting equipment. In the context of hoisting operations, superimposed loads refer to additional weights or forces that affect the lifting capacity and balance of the equipment. Typically, the weight of the spoil pile, which is the material removed from the ground, is a significant load that needs to be accounted for, as it can shift and impact the center of gravity.

Similarly, the weight of the hoisting equipment itself is a crucial factor. This weight directly affects the overall load that the hoist system must support and can change the load dynamics during operation. Traffic adjacent to the work area represents external forces and potential impacts that can also influence the stability of the hoisting operation.

In contrast, while the operator’s weight is a factor in terms of overall safety considerations, it is generally considered negligible in the context of superimposed loads. The primary focus is on the loads that can significantly affect the performance and safety of the hoisting equipment. Therefore, the operator's weight does not factor into the same category as the other listed considerations.