When using a tag line, it is primarily intended to:

The purpose of a tag line is to provide control over the lateral movement of a load. When a load is being lifted or moved, it can swing or shift due to wind or uneven surfaces, potentially posing a safety hazard. A tag line allows the rigger or ground crew member to manage this movement effectively. By providing a means to guide the load, a tag line reduces the risk of unintended movement that could lead to accidents or injury.

Utilizing a tag line is particularly important when lifting heavy or bulky items, as it helps maintain both safety and precision during movement. This control is critical in situations where obstacles are present or where the load needs to be maneuvered into a specific position without the risk of it swaying or colliding with other objects.

The other options would not accurately represent the primary function of a tag line—lifting the load higher, lowering the load safely, or signaling operators may involve various other equipment or methods, but they do not encompass the key role of a tag line in promoting safe and controlled lateral movement of the load.