Common utility duct stores all the major utilities in one common duct. There are many advantages for cities and towns to adopt such a system, such as maximizing efficiency of underground ground space usage, decreasing costs of maintenance of utilities, decreasing above ground construction which may disrupt traffic, and creating an area for easy access to utilities repair. Furthermore, protection of all utilities can be done under the common utility duct during natural disasters. Since the early to mid-1990s, MAA has been the pioneer in implementing the common utility duct concept throughout Taiwan. For example, common duct along the Taipei Xinyi Metro line was the first common duct project to be designed along an MRT line and it was the first common duct to utilize the Shield Tunneling System. With the knowledge and experiences in geological information system, (GIS) system planning and development engineering, engineering design and legal understanding, MAA has provided governments feasibility studies as well as planning, organization and implementation of common utility duct systems. MAA has written many specifications for the government to regulate, maintain, control and design these systems.

• Common Utility Duct System Planning for Taipei City, Kaohsiung City, Hsin Chu city and Chiayi City of Taiwan
• Nankang Trade and Commerce Park Common Utility Duct, Taiwan
• Keelung River New Community Common Utility Duct, Taiwan
• Kaohsiung New Town Common Utility Duct, Taiwan
• Common Utility Duct for Taipei MRT Hsin Yi Line and SongShan Line, Taiwan
• Taipei Dadu Road Common Utility Duct, Taiwan