408 ITU‐T's Technical Reports and Specifications 3.1.7 Risks or vulnerabilities which need to be considered with shared infrastructure A utility tunnel with multiple service providers requires: Easy access for repair or maintenance Access authorization, security (keys/locks) to minimize theft and wilful damage Wet and dry partitions to maintain continuity of service in event of flooding. Allowing for changes in climate is increasingly being considered as a factor which affects the lifecycle of an asset such as a railway or telecommunication facility [b‐8]. A risk assessment of built infrastructure may be carried out according to guidelines in [b‐8]. Dual networks and/or multiple service providers should be considered as methods to maintain service continuity against a single point of failure in telecommunications networks. Example 1: Dual‐fiber entry to all buildings with more than 100 occupants. Example 2: Both wired and wireless (cellular) services to be accessible in all buildings. Figure 18 – Ensuring Telecommunications Service Continuity [Source: ITU‐T, b‐9]