Which hand signals indicate "move right" and "move left"?

The hand signals that indicate "move right" and "move left" are correctly associated with the signal of extending the arm horizontally. When the arm is extended to the right with a horizontal motion, it clearly communicates to the operator to move towards the right. Conversely, extending the arm to the left in a similar manner signals the operator to move to the left. This method of signaling uses clear, visible motions that can easily be understood from a distance.

Using horizontal arm movements is a well-established practice in crane signaling, allowing for unambiguous communication between ground workers and machine operators, which is particularly critical in ensuring safety and efficiency on the job site.