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Houses, apartments, factories, offices, schools, roads, and bridges are only some of the products of the construction industry. This industry's activities include the building of new structures, including site preparation, as well as additions and modifications to existing ones. The industry also includes maintenance, repair, and improvements on these structures. The construction industry is divided into three major segments. The construction of building segment includes contractors, usually called general contractors, who build residential, industrial, commercial, and other buildings. Heavy and civil engineering construction contractors build sewers, roads, highways, bridges, tunnels, and other projects. Specialty trade contractors perform specialized activities related to construction such as carpentry, painting, plumbing, and electrical work. Construction usually is done or coordinated by general contractors, who specialize in one type of construction such as residential or commercial building. They take full responsibility for the complete job, except for specified portions of the work that may be omitted from the general contract.