**2. Best practices to maintain the sustainability of infrastructure projects**

This section discusses the best practices to maintain the sustainability of infrastructure projects during their service life. These practices are explained in five categories as it can be seen in **Figure 3**. In each category, the recommended policies and practices are sub-categorized and discussed. These practices can be applied to any infrastructure facility or specific ones. Facility managers, decision-makers, and maintenance operation personnel must understand the necessity of investing in the implementation of these practices and motivate other personnel to a collaborate effort for maintaining a high quality of service from the facility as well as minimizing the negatives impacts of the infrastructure on the triple bottom lines of sustainability.
