Construction roads and railways
Construction and maintenance of motorways, streets, roads, other vehicular and pedestrian ways, highways, bridges, tunnels and subways
Construction and maintenance of railways and rail-bridges
Construction and maintenance of airfield runways
Construction of utility projects
Construction and maintenance of power plants
Construction/erection and maintenance of power, telecommunication and transmission lines
Construction of long distance pipelines or urban pipelines
Construction and maintenance of water main and line connection, water reservoirs including irrigation system (canal)
Construction and repair of sewer systems including sewage disposal plants and pumping stations
Construction of utility projects n.e.c.
Construction and maintenance of industrial facilities such as refineries chemical plants etc.
Construction of waterways, harbours and river works, dredging of waterways
Construction of dams etc.
Construction of outdoor sports facilities
Wholesale trade and commission trade, except of motor vehicles and motorcycles