The following article provides introduction to vehicular ad hoc networks and brief overview of participating organizations, currently solved projects and latest technologies used for mutual communication of vehicles and traffic infrastructure. The goal of this article is to summarize general knowledge about the topic known as Vehicle-to-Everything (V2X) and more deeply to describe perspective communication technologies intended not for only communication among vehicles, but among vehicles, pedestrians and existing, not connected traffic infrastructure. The basis of all kinds of data and knowledge transfer among above mentioned devices are different types of sensors present in moving vehicles, pedestrians and fixed objects present on roads inside and outside of the connected cities. Sensors and communication infrastructure based on current wireless and wired connection, communication protocols and brand new algorithms are mentioned in order to build perspective services for next generation citizens.