When the trolley of a traveling crane is to be moved, you should signal by which gesture?

• A. holding the palm of your hand up with your fingers closed, pointing your thumb in the direction of motion, and jerking your hand horizontally
• B. extending your arm forward with your hand open and slightly raised, and making a pushing motion in the direction of travel
• C. extending your arm with the palm of your hand down, and moving your arm back and forth horizontally
• D. holding your forearm vertical with your forefinger pointing up and moving your hand in a small horizontal circle

Answer: (A)

The main idea is using a distinct, quickly understood hand signal to tell the crane operator to move the trolley in a specific direction. The gesture of a fist with the palm up, thumb pointing toward the direction of travel, and a quick horizontal jerk communicates a clear “move the trolley in that direction now” instruction. This combination is designed to be quickly read at a distance and to avoid confusion with other signals.

The other gestures don’t convey the same precise directive for trolley travel. An open hand pushed forward is typically a different cue and may be interpreted as a general go-ahead or a different action, while the palm-down motion, a forearm with a small circular movement, or a vertical forearm with a finger up signal other actions or attention cues rather than traveling the trolley.