Today, rapidly increasing urbanization and population density cause serious traffic problems in cities. Among these problems, the inadequacy of public transportation systems used by a significant number of people, especially in large cities, is also a serious problem. IoT (Internet of Things) and Artificial Intelligence technologies, which have gained importance in recent years, are used to provide solutions to traffic and public transportation problems in cities. In this study, IoT and Artificial Intelligence technologies in public transportation and public transportation systems are discussed and theoretically examined. As a result, IoT-based smart public transportation systems stand out as one of the cornerstones of the smart cities of the future as well as solving today's transportation problems.