This Car-To-Car Communication is a vital information module for driving comfort and safety. It changes the role of automobiles from mere objects used for transportation to smart vehicles capable to talk to each other through wireless communication. The goal is to develop new functionalities for cars and trucks offering driver information system (DIS). Necessary interaction between the driver and automated systems shall be enabled by advanced sensors, cooperative vehicle technologies and adaptive strategies. In this paper we present the potential of future car-to-car and car-to-environment communication systems, introduce the major research challenges in this field, and provide a selection of current research results.