What is the primary function of the tag line when hoisting a ladder?

The primary function of the tag line when hoisting a ladder is to keep the ladder in control. The tag line serves as an important safety tool, ensuring that the ladder remains stable and does not swing or become unwieldy during the hoisting process. It allows firefighters to manage the ladder's movement from a safe distance, helping to prevent accidents and maintain proper positioning.

The controlled movement provided by the tag line is essential, especially in environments where obstacles or high winds may pose risks. By securing one end of the tag line to the base of the ladder while hoisting it, firefighters can guide and stabilize the ladder as it ascends, ensuring it reaches its desired location safely and effectively.

Other options involve incorrect or unrelated functions. For example, while measuring the height reached or assisting in lowering are important considerations in ladder operations, they do not accurately describe the primary purpose of the tag line during hoisting. This specific function of stability and control is what differentiates the tag line from other potential accessories or tools used in ladder operations.