What is the function of tag lines in crane operations?

Tag lines play a crucial role in crane operations by helping to control the load being lifted, especially when it is suspended and subject to wind or other external forces. Their primary function is to prevent the load from swinging, allowing for safer and more precise placement of the load. When a load is being lifted or moved, it can easily become unstable or shift due to various factors, potentially leading to accidents or injuries.

By using tag lines, operators and riggers can exert a pulling force on the load in a controlled manner, stabilizing it and ensuring that it moves in a desired direction. This manipulation helps maintain the alignment of the load with the crane's path, reduces the risk of collisions, and enhances overall safety in the work area.

The other options describe functions that are not the primary purpose of tag lines. While securing the load before lifting is vital for safety, it is typically achieved through rigging methods rather than through the use of tag lines. Signaling the operator is more commonly done through visual communication or radio communication, and checking load weight is a separate process performed using scales or load monitoring systems.