A smart city should provide an urban environment that provides residents with a high quality of life while generating economic growth. Improving smart cities also adds new value to existing infrastructure, while creating new revenue streams and operational efficiencies, helping to save money for governments and citizens. Smart cities are not just a global trend, it is not some modern technological revolution that everyone dreams of, in fact smart cities are a necessity and must be implemented as soon as possible. The success of a smart city requires collaboration with civilian authorities, such as local or federal privacy commissioners, as coordination between different levels of government is often the biggest challenge for smart cities. By applying new generation intelligent transport systems, Rijeka can achieve even better results in the development of sustainable mobility in the city in the future. As a strategic framework for the future development of the smart city, in February 2019, the City of Zagreb adopted the Framework Strategy of the Smart City of Zagreb - Zagreb Smart City. This strategy provides guidelines for the application of innovative ways of using resources and new technology, better coordination of city administrations as well as active involvement of citizens in the development of the city. The future of cities lies in merging new technologies with existing infrastructure to address tangible, urgent issues such as environmental sustainability and economic opportunities. Successful smart cities will build a strong, flexible, digital infrastructure that integrates new technology into the existing structure.