388 ITU‐T's Technical Reports and Specifications 1 Introduction New cities are being planned in some countries where there is rapid growth in industrialisation. This leads populations to migrate from a rural to an urban environment to seek higher paid employment. This trend is expected to continue at least to year 2050. City planners therefore have the task of planning a city with a 'clean sheet of paper'. It is intended that this document will also be applicable to for suburban or city expansion which is being planned on a clean slate. Until now city infrastructure, including ICT, has evolved to meet the needs of 'organic growth' whereby villages grew into towns and then into cities as populations have grown. Each new building or group of buildings was planned at a different time. This document focuses on answering the question, \"How should ICT infrastructure be planned for a new city given that it has to be both 'smart' and 'sustainable'?\". The ICT infrastructure can then be planned and a set of technical requirements can be drawn up. After that, relevant specifications can be written, drawing upon the wealth of existing ICT specifications and standards. The approach taken assumes that the city or development area of an existing city is to be built from new with no existing structures above or below ground. A feature which is new for smart sustainable cities (SSCs) is the need for a sensor layer network and peripheral devices which may be directly connected to the internet, i.e., the internet of things (IoT). Sensors may be connected directly to a source of power and transmission such as an electricity cable or metallic pair. Sensors which require high bandwidth could be connected by optical fibre and wire for electricity. Sensors which use radio communication would need a source of power such as batteries. Building and maintaining telecommunications and sensor layer networks is expensive, especially when installed on a reactive basis to meet emerging demand. To reduce costs, this document explores the opportunities for infrastructure sharing from the outset. The infrastructure could focus on a central location, such as the main railway station, city centre, or multiple clusters forming a city, where high capacity services are radiate towards the periphery of the city where individual homes, people, places and things require services. Shared infrastructure can save significant costs, especially when provision is made for maintenance, upgrade and growth over the lifecycle. The primary concern for all types of installation is safety. 2 Scope These Technical Specifications describe the various infrastructures for a smart sustainable city in a new‐development area. The designated infrastructure in this document includes: common physical infrastructure highlighting ICT, ducted and trenched infrastructure below ground, over ground common physical infrastructure, common risers in buildings, etc. The following issues are considered: safety, maintenance, lifecycle including possible obsolescence, flexibility points, scalability and growth. Examples are included of best practices for physical infrastructure including opportunities for sharing service paths below and above ground, such as conduits. NOTE – Sharing wireless service infrastructure, such as lampposts and masts is mentioned in the FG‐SSC report \"EMF Considerations in Smart Sustainable Cities\" [b‐24].