When a tugger is mounted where the operator cannot see the load, the signal person MUST use:

The reason "signals used for cranes" is correct in this context is that when a tugger (a type of winch or hoisting device) is positioned where the operator's view of the load is obstructed, clear and standardized communication is essential to ensure safety and effectiveness. Using signals that are established for crane operations is appropriate because those signals are designed for scenarios involving the movement of loads where visibility is compromised.

These crane signals are well understood within the industry, providing a consistent language that both the signal person and the operator can rely upon to communicate the necessary commands for lifting, lowering, or maneuvering the load without direct line of sight. Adopting these universal signals enhances safety by minimizing the risk of miscommunication, which can lead to accidents.

While tugger type signals or aggressive signals may seem relevant, they are not the standard protocols utilized for ensuring safety in this specific situation where visual confirmation is lacking. Overhead crane signals, though similar, specifically cater to cranes; thus, utilizing them in this scenario frames a standardized and widely accepted approach for rigging and load management, ensuring that both the tugger and its operation align with best practices.