This final work presents the topic entitled "Implementation of Intelligent Transport Systems in Traffic" and is essentially divided into six chapters. The first, and at the same time, the initial chapter, is an introduction, in which something elementary is said about the subject, and it is a brief introduction to the theme. In the second chapter, it begins with the elaboration of the theme, where something is said about general things related to intelligent transport systems. Thus, the architecture of each ITS system is described, a detailed standardization of ITS services was developed, the efficiency and quality of ITS services were analyzed and ITS directives and ITS development plans in the Republic of Croatia related to the EU guidelines were presented for the end of the chapter. The third chapter is the central one of work, describing the very development of the ITS system in the Republic of Croatia. We are concerned with the economic benefits and the positive effects for the economy of the Republic of Croatia, as far as the introduction of ITS is concerned, as well as the guidelines, strategic goals and incentives of the European Union, which enables the easier and more efficient development of intelligent systems. For the end of this chapter, SWOT analysis was developed for ITS development in our country. Fourthly, some examples of ITS traffic control and control systems are provided. So we have a description of the camera system for measuring speed of the vehicle, the system for automatic recognition of the registration labels, variable speed limit signs, vehicle passage recognition system in red light, and the ITS system for compliance with speed limitations. The fifth chapter is related to the ITS system used for traffic control and management in Zagreb, Rijeka, Zadar and on motorways in the Republic of Croatia. They are fully described and analyzed in detail. The sixth and final chapter is the one concluding, where the topic is briefly systematized from the previously stated things in the work.