Cooperative intelligent traffic environment includes a platform on which different transport systems without barriers, and special adaptations smoothly exchange traffic information. The sources of traffic data in addition to sensor networks imply other heterogeneous sources of traffic data. These sources are located at different levels in terms of information, ranging from tehnological level all the way to specialized traffic data. In this final work, these issues will be worked out through the following levels: The first level is an introduction in which we give a brief description of the whole final work where we cover other parts of the mentioned final work and we begin to further describe the cooperative traffic environment, its purpose and function, as well as other advantages of using the same. The following section refers to information pre-trip and on-trip information in a cooperative environment, which we define in what ways they can provide relevant information to vehicle operators and travelers. This is followed by the sources of traffic and travel information, which are considered from different aspects depending on the type of traffic and in the end we have covered a case analysis in which we are based on traffic and travel information in public transport, its shortcomings and the measures that should be introduced to improve the system.