Which signal should be used to stop a traveling crane immediately in an emergency?

Which signal should be used to stop a traveling crane immediately in an emergency?

• 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 both arms extended with the palms of your hands down, and moving both arms back and forth horizontally

Answer: (D)

In emergencies, operators rely on standardized signals that are instantly recognizable and unambiguous. The quickest, most unequivocal way to halt a traveling crane is to extend both arms to the sides, palms facing down, and move both arms back and forth horizontally. Using both arms makes the stop signal highly visible from any direction and in noisy environments, so the operator can stop immediately without confusion. Other gestures aren’t as clear or are used for different instructions, which could delay the stop or lead to miscommunication. This two-arm, palms-down back-and-forth signal is the standard emergency stop cue used in crane signaling to protect people and equipment.

In emergencies, operators rely on standardized signals that are instantly recognizable and unambiguous. The quickest, most unequivocal way to halt a traveling crane is to extend both arms to the sides, palms facing down, and move both arms back and forth horizontally. Using both arms makes the stop signal highly visible from any direction and in noisy environments, so the operator can stop immediately without confusion.

Other gestures aren’t as clear or are used for different instructions, which could delay the stop or lead to miscommunication. This two-arm, palms-down back-and-forth signal is the standard emergency stop cue used in crane signaling to protect people and equipment.