Under what condition may a roof ladder be used as a free-hanging ladder?

A roof ladder should never be used as a free-hanging ladder because its design is specifically intended for stability and support when it is leaned against a structure, typically with the hooks secured over the roof edge. Using a roof ladder in a free-hanging manner can lead to instability and an increased risk of falling, as the ladder is not engineered to function effectively without being secured in place. The safety and structural support required when using ladders in firefighting operations are paramount to prevent accidents and injuries. Therefore, adhering to this guideline is crucial for firefighter safety.