★★★★★★★★★ Standard posture for commanding crane ★★★★ Standard posture for commanding crane boom to rise: fists clenched with both hands. Give your thumbs up. Wave to the crane operator regularly and rhythmically. (This is a gesture to raise the crane boom.) Boom lowering: make a fist with both hands. Put down your thumb. Wave to the crane operator regularly and rhythmically. This is a gesture to let the crane boom down. ) to the left Boom: Hold your hand into a fist. Extend your thumb to the left. Wave to the operator on the crane regularly and rhythmically. This is a gesture to make the crane boom to the left. ) Boom to the right: Hold your hand into a fist. Put your thumb to the right. Wave to the operator on the crane regularly and rhythmically. This is a gesture to make the crane boom to the right. ) Move the hook head of the crane upward: combine the palms into a fist shape. Extend your index finger upward. Turn your index finger to the operator on the crane regularly and rhythmically. If you want the hook to move up quickly, turn your index finger quickly and let the hook move slowly. Turn your index finger slowly. This is a gesture to move the hook of the crane upward. ) Move the hook head of the crane downward: make the palm of your hand fist-shaped. Extend your index finger downward. Turn the index finger regularly and rhythmically to the operator on the crane. If you want the hook head to move down quickly, turn the index finger quickly to make the hook head move slowly. Turn your index finger slowly. (This is a gesture to move the crane hook head down. ) Supplement: It is best for the commander to stand in a safe place where the crane operator can easily see it. Gestures are clear, it is best to wear clean white gloves to direct, which is more eye-catching and easy to identify. It would be more perfect if they connected by intercom.