With the wide-spread of wireless communication units, it is probable to establish an inter-vehicle communication (IVC) network to collect and distribute traffic and other information in a distributed fashion. Key performance measures of such a system include information throughput and communication delay between a pair of source-destination pair. In this research we propose to study the performance of IVC in traffic streams on unidirectional roads, bidirectional roads, and road networks both theoretically and with simulations based on Network Simulator 2. We will investigate the impacts on IVC of different market penetration rates, transmission ranges, number of information source-destination pairs, and routing protocols. The research would be helpful for better understanding of the feasibility and benefits of an advanced traveler information system based on an IVC system.