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| A '''common utility duct''' is any structure--above, on, or below ground--which carries more than two types of public utility lines. However, the phrase often refers to underground tunnels.{{ref|def}} | |||
| ==Advantages of common utility ducts== | |||
| The advantages of such facilities are the reduction of maintenance manholes, one-time relocation, and less excavation and repair. One of the greatest advantages is public safety. Common utility ducts prevent downed power lines and other utilities from blocking roads, thus speeding emergency access after major natural disasters like earthquakes, hurricanes, and tsunamis. They also allow rapid access to all utilities, without having to dig access trenches or resort to confused and often inaccurate utility maps. | |||
| ==Examples of common utility ducts== | |||
| Many examples of common utility ducts are found in Japan, where government officials have sought ways to reduce the catastrophic effects of earthquakes in their tectonically active country. Their use, however, is not limited to that country and there are many examples of such common utility ducts. These include: | |||
| # Incporated with Xinyi{{ref|xinyi}} and Sonshan MRT ] lines in ] | |||
| #Azabu-Hibiya Common Utility Duct in ]{{ref|azabuhibiya}} | |||
| #Minatomirai District lines in ]{{ref|yokohama}} | |||
| ==References== | |||
| #{{note|def}} | |||
| #{{note|xinyi}} | |||
| #{{note|azabuhibiya}} | |||
| #{{note|yokohama}} | |||
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