The aim of this research was to explore and analyze the regulations of social legislation in road transport of goods and passengers at the European Union and Croatian levels. The purpose of this work is to systematically present the structure of regulations and social legislation in one place, the scope of their application, and the expected outcomes in terms of contributing to road traffic safety within the European Union. Therefore, the first part of the paper describes the levels of social legislation in road transport, as well as the tachograph system, which forms the basis for applying these regulations. The remaining sections provide the key provisions of Croatian and EU regulations governing this field. The final part presents a practical solution for managing and optimizing the working hours of mobile workers, specifically the Skytrack system. The paper argues that social legislation regulations in road transport significantly contribute to organizing mobile workers' working hours, ensuring appropriate rest periods and free time, and actively enhancing the safety of road transport and road traffic in general.