IEEE 802.11p based Dedicated Short Range Communication (DSRC) has been considered as a promising wireless technology for enhancing road safety and efficiency. However, there is lack of deep understanding about how IEEE 802.11p performs for vehicle-to- vehicle (V2V) communications in urban environments. In this demo paper, we first introduce the statistical analysis results on V2V communication performance, based on a large volume of real-world measurement trace collected in Shanghai city. With the key insights observed in our experiments, we propose a novel scheme to synthesize V2V communication traces which can be of great value for VANET-related research, such as network protocol design and simulations.