Which of the following is considered a safety hazard when using scaffolding?

Overloading the scaffolding is indeed a significant safety hazard. Scaffolding is designed to support specific weights; exceeding this limit can compromise its structural integrity. This can lead to catastrophic failures, including collapses that can cause serious injuries or fatalities. It is vital to adhere to load limits established by manufacturers and relevant safety regulations to ensure that the scaffolding can safely support the intended loads, including workers, materials, and equipment.

In contrast, using correctly sized planks, properly securing jacks, and following load limits are all best practices aimed at enhancing safety. Correctly sized planks ensure that the working platform is stable and secure, while securely positioned jacks help to maintain structural support. Following load limits is critical in preventing overload, but in this context, it is the act of overloading that specifically represents a safety hazard.