Which equipment is critical for preventing load movement during transportation?

The correct choice is tag lines. Tag lines are essential pieces of equipment used to control and stabilize loads during transportation, particularly when rigging is involved. They allow riggers to manipulate a load remotely and can help ensure that it does not swing or rotate unexpectedly, reducing the risk of accidents and ensuring that the load remains steady while being moved.

Using tag lines effectively helps maintain control over the load's movement, especially in windy conditions or when navigating tight spaces. They are typically attached to the load and held by workers positioned away from the load path, providing better control and safety for personnel involved in the lifting and transportation process.

In contrast, winches are primarily used for lifting or pulling loads rather than stabilizing them during transport. Safety hooks, while important for securing loads, do not specifically prevent load movement. Load binders help in securing the load to the transportation device but do not offer the same level of control over lateral movement that tag lines do. Hence, in the context of preventing load movement during transport, tag lines are the critical equipment.