Crane Note: Each crane nominal weight must hang signs in conspicuous places. Working in 200 tons truck crane, was not allowed to transport people or hook on the bridge. No operating permits and drink are not allowed to drive a crane. Operation must concentrate, not allowed to talk, smoke or do has nothing to do. To clean the car; allowed misplacing equipment, tools, flammable and explosive materials and hazardous materials. Crane of structure: bridge cranes. In rectangular space and over the job, and more for workshops, warehouses, open yard loading and unloading goods, etc., have girder cranes, bridge cranes, Cranes bridge, carrying bridges. Girder cranes: Beam cranes including single girder crane and double girder bridge crane.