In an era of growing urbanization and complex of transportation networks, emerging technologies in the fields of the Internet of Things (IoT) and Intelligent Transportation Systems (ITS) are revolutionizing the way vehicles communicate with each other and with surrounding infrastructure. This thesis explores the evolution of these new technologies, outlining the continuous progression from assisted driving, enabled by Advanced Driver Assistance Systems (ADAS), to automated driving made possible by vehicular-to-everything (V2X) communication. The research begins with an overview of intelligent transportation systems, followed by a detailed analysis of Vehicular Ad Hoc Networks (VANETs). It examines various communication protocols, such as Dedicated Short-Range Communication (DSRC) and Cellular-V2X (C-V2X), highlighting their advantages, challenges, and potential future developments, such as the introduction of new standards like IEEE 802.11bd and 3GPP releases 18 and 19.