Building a "Network on Wheels"
Motor vehicles, however, pose special problems for networks. With vehicles moving rapidly between nodes and attempting to communicate with one another in an ad hoc manner, security, authentication and seamless communication all become crucial concerns.
To address this problem, the German government has authorized the Network on Wheels project to address inter-vehicle communication systems while the technology is still in its relative infancy. The project will examine how vehicles interact, how to ensure the privacy of drivers, and how to guard the network against malicious attacks.
Source: Roland Piquepaille's Technology Trends