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More than half of the world\u2019s population currently\u00a0lives in cities<\/a>\u00a0and this share is expected to rise to nearly 70% by 2050.<\/p>\n It\u2019s no wonder \u201csmart cities\u201d have\u00a0become a buzzword<\/a>\u00a0in urban planning, politics and tech circles, and even media.<\/p>\n The phrase conjures images of self-driving buses, traffic lights controlled by artificial intelligence (AI) and buildings that manage their own energy use.<\/p>\n But for all the attention the term receives, it\u2019s not clear what actually makes a city smart. Is it about the number of sensors installed? The speed of the internet? The presence of a\u00a0digital dashboard<\/a>\u00a0at the town hall?<\/p>\n Governments\u00a0regularly speak of future-ready cities<\/a>\u00a0and the promise of \u201cdigital transformation<\/a>\u201d. But when the term \u201csmart city\u201d is used in policy documents or on the campaign trail, it often lacks clarity.<\/p>\n Over the past two decades, governments around the world\u00a0have poured billions<\/a>\u00a0into smart city initiatives, often with more ambition than clarity. The result has been a patchwork of projects: some genuinely transformative, others flashy but shallow.<\/p>\n So, what does it really mean for a city to be smart? And how can technology solve real urban problems, not just create new ones?<\/p>\n The term \u201csmart city\u201d has been applied to a wide range of urban technologies and initiatives \u2013 from traffic sensors and smart meters to autonomous vehicles and energy-efficient building systems.<\/p>\n But a consistent, working definition\u00a0remains elusive<\/a>.<\/p>\n In academic and policy circles, one widely accepted view is that a smart city is one where technology is used to enhance key urban outcomes: liveability, sustainability, social equity and, ultimately,\u00a0people\u2019s quality of life<\/a>.<\/p>\n What matters here is whether the application of technology leads to measurable improvements in the way people live, move and interact with the city around them.<\/p>\n By that standard, many \u201csmart city\u201d initiatives\u00a0fall short<\/a>, not because the tools don\u2019t exist, but because the focus is often on\u00a0visibility and symbolic infrastructure<\/a>\u00a0rather than impact.<\/p>\n This could be features like\u00a0high-tech digital kiosks<\/a>\u00a0in public spaces that are visibly modern and offer some use and value, but do little to address core urban challenges.<\/p>\n The reality of urban governance \u2013 messy, decentralised, often constrained \u2013 is a long way from the seamless dashboards and simulations often promised in promotional material.<\/p>\n But there is a way to help join together the various aspects of city living, with the help of \u201cdigital twins\u201d.<\/p>\n Much of the\u00a0early focus on smart cities<\/a>\u00a0revolved around individual technologies: installing sensors, launching apps or creating control centres. But these tools often\u00a0worked in isolation<\/a>\u00a0and offered limited insight into how the city functioned as a whole.<\/p>\n City digital twins represent\u00a0a shift in approach<\/a>.<\/p>\n Instead of layering technology onto existing systems, a city digital twin creates a virtual replica of those systems. It links real-time data across transport, energy, infrastructure and the environment. It\u2019s a kind of living, evolving model of the city that changes as the real city changes.<\/p>\n This enables planners and policymakers to\u00a0test decisions before making them<\/a>. They can simulate\u00a0the impact of a new road<\/a>, assess\u00a0the risk of flooding<\/a>\u00a0in a changing climate or compare the outcomes of different zoning options.<\/p>\n Used in this way, digital twins support decisions that are better informed, more responsive, and more in tune with how cities actually work.<\/p>\n Not all digital twins operate at the same level. Some offer little more than 3D visualisations, while others bring in real-time data and support complex scenario testing.<\/p>\n The most advanced ones don\u2019t just simulate the city, but interact with it.What is a smart city, then?<\/strong><\/h4>\n
Digital twin (of?) cities<\/strong><\/h4>\n
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