Road motor vehicle manufacturing; construction labor subcontracting; construction engineering construction; highway management and maintenance. General items: Automotive parts and accessories manufacturing; automotive parts research and development; vehicle sales; new energy vehicle sales; motor vehicle repair and maintenance; environmental protection special equipment manufacturing; environmental protection special equipment sales; professional design services; technical services, technology development, technical consulting, technical exchange, technology transfer, technology promotion; mechanical equipment research and development; mechanical and electrical equipment manufacturing; mechanical and electrical equipment sales; tunnel construction special machinery sales; tunnel construction special machinery manufacturing; electronic and mechanical equipment maintenance (excluding special equipment); mechanical equipment leasing; special equipment leasing; professional cleaning, washing, and disinfection services; municipal facility management; environmental sanitation management (excluding environmental quality monitoring, pollution source inspection, and disposal of domestic waste, construction waste, and kitchen waste); engineering management services; general mechanical equipment installation services.