Cooperative mobility shall achieve a safer, more economical and more ecological driving. Assessing the expected impacts is crucial to detect the technical and economic challenges for operating cooperative systems at large scales. Simulation environments such as VSimRTI are proved as a proper tool for an assessment of cooperative ITS solutions. In PRE-DRIVE C2X, VSimRTI was established as the integrated simulation tool set enabling the detailed modeling of vehicle traffic, wireless communication, and cooperative applications. Consequently, VSimRTI is further used for several evaluations in DRIVE C2X.