There are standard hand signals that all crane operators and the people who hire them should know. Additionally, three rules and a suggestion can make communication a sure thing.
1. Keep your signal in one place.
2. If you can’t see the operator through a maze of studs, trusses or bracing, the operator can’t see you. Make eye contact, and then make your signals in front of your face.
3. If your gloves and clothing are of similar colors, make your signals away from your body where the operator can see.
Jim Anderson, a contractor in Littleton, Colorado, and author of Framing with a Crane, adds that besides the hand signals demonstrated in this video, two-way radios can also be used.