Plexe is an extension of the popular Veins vehicular network simulator which permits the realistic simulation of platooning (i.e., automated car-following) systems. It features realistic vehicle dynamics and several cruise control models, permitting the analysis of control systems, large-scale and mixed scenario, as well as networking protocols and cooperative maneuvers. It is free to download and easy to extend.
If you use Plexe, please cite our work as
Michele Segata, Stefan Joerer, Bastian Bloessl, Christoph Sommer, Falko Dressler and Renato Lo Cigno, "PLEXE: A Platooning Extension for Veins," Proceedings of 6th IEEE Vehicular Networking Conference (VNC 2014), Paderborn, Germany, December 2014. [BibTeX, Details...]
plexe-devbranch (go to github).