This open access book explores the use of technologies for urban safety and security. Rather than focusing on the technologies themselves, it provides and in-depth analysis of the complex urban transformations linked to the increasing integration of technical systems in the built environment. Interdisciplinary contributions explain how technologies can improve urban safety, whilst offering a broader discussion relative to urban, socio-economic and political factors. Against simplistic techno-solutionist ideas, the authors illustrate the role of technology as means to an end and show how technologies can widen our understanding of safety and security. Readers are introduced to issues relative to the practical implementation, development, and testing of urban technologies via numerous case studies from cities around the world.