ITU‐T's Technical Reports and Specifications 405 An example of a multi service tunnel construction standard which has been used in many cities in Italy [b‐29] is shown below. This standard considers the possibility of coexistence in the utility tunnel of the following services: distribution networks of aqueducts; electricity distribution grids; electrical networks for public lighting systems and systems for traffic lights; telecommunications networks (telephone, data transmission, cable TV, etc.) and district heating networks. Figure 16 – Example Utility Tunnel of Rectangular Cross section [Source: Italian Norm, b‐29]