An operator was positioning a 25-ton crane in preparation of concrete activities. The crane, which was replacing a smaller 20-ton model, was to be positioned near a large 3 m deep excavation in which concrete foundations were being constructed. While manoeuvring, the crane operator drove too close to the edge, and crashed down on its side into the excavation. The operator, who was wearing a seatbelt, sustained an elbow dislocation of the left arm. Injury would have been worse had he not used the seatbelt.