The TT Club is urging container terminal operators to fit electronic sensor devices to quay crane booms to prevent them accidentally colliding with vessels during loading and unloading operations in port. The TT Club says that crane booms colliding with the structure or equipment of a ship is an all-to-common occurrence at almost every port around the world, causing serious injuries to workers and costly repairs and operational downtime. In advising its Members and the industry at large, TT Club highlights the frequency of such collisions, and recommends installing effective boom anti-collision systems. Among the various types of device currently in use, the simplest consists of wires run along the length of the crane boom, which activate a switch to stop the crane if they are hit.