Technologies for ad hoc networking will enable car companies to include new safety and communication features into their cars. For example, efficient accident warnings are possible: Cars involved in an accident can send warning messages back over a number of other vehicles, thus avoiding motorway pileups. We could also envision person-to-person applications using ad hoc communication between vehicles (e.g., simple text messaging, game communities, or even hop-by-hop telephony). The goal of a panel at the 2005 MINEMA Summer School in Klagenfurt, Austria (July 11-15), was to discuss potential and feasible applications, technology and research challenges, visions, roadmaps, and risks of such scenarios. Each of the panelists gave a 5-10 minute statement, followed by a 20-minute discussion with questions from the audience. Panelists Moderator and Organizer: Christian Bettstetter (DoCoMo Euro-Labs, Munich, Germany) Hannes Hartenstein (University of Karlsruhe, Germany) Jean-Pierre Hubaux (EPFL, Lausanne, Switzerland) Timo Kosch (BMW Research and Technology, Munich, Germany) Kirsten Matheus (CarMeq, Berlin, Germany) Charles E. Perkins (Nokia Research, Mountain View, USA)