6G communication is a revolutionary technology in wireless communication. It overtakes the 5G technology in terms of security. 6G opens its boundaries for the various Internet of Things applications in smart cities. Internet of Vehicles (IoV) sends and receives traffic-related data between various entities such as vehicles, pedestrians, roadside units (RSUs), mobiles, cloud servers, and other entities. This advancement in 6G ensures that communication between entities is more secure in an IoV environment. The increasing number of entities causes trust and privacy issues as it generates massive amounts of data with increased mobility. This chapter introduced the blockchain concept, which provides security and privacy in the IoV environment. Simultaneously, federated learning (FL) protects the user’s privacy. FL reduces the attacks and ensures privacy by storing the information locally. In addition, blockchain provides immutability by allowing only trusted parties to participate. Integrating blockchain and FL provides more security among various entities in transportation systems. This chapter discusses the blockchain and FL challenges and 6G communication technology solutions. The simulation is performed using SUMO simulator to achieve the dynamic vehicular environment.