Sales of mechanical equipment; manufacturing of traffic safety and control specialized equipment; manufacturing of metal signs for traffic and public management; sales of metal products; sales of metal materials; research and development of mechanical equipment; manufacturing of metal structures; sales of metal structures; sales of rubber products; sales of glass fiber reinforced plastic products; manufacturing of concrete structural components; sales of concrete structural components; sales of automobiles; motor vehicle repair and maintenance; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; leasing services (excluding licensed leasing services); asset management services with self-owned funds; labor services (excluding labor dispatch); import and export of goods; general cargo warehousing services (excluding items requiring permits such as hazardous chemicals); technology intermediary services; intellectual property services (excluding patent agency services); leasing of non-residential real estate; leasing of land use rights; sales of office supplies. Licensed items: construction engineering construction; production of road motor vehicles; manufacturing of special equipment; highway management and maintenance; construction labor subcontracting; road cargo transport (excluding dangerous goods); road transport of dangerous goods.