These last years have seen the multiplication of traffic agent- based frameworks (MATSim, SUMO...). If these frame- works are well-fitted for the study of normal traffic con- ditions, it is often complex to adapt them - in particular for non-computer scientists - for more specific application contexts such as the study of impacts of uncommon events (e.g. car accidents, technological hazards). In this paper, we present a new open-source (GPL) tool, integrated into the GAMA modeling and simulation platform, allowing to easily define new microscopic traffic simulations, easily tun- able, with a detailed representation of the driver operational behaviors. In particular, it allows to take into account the road infrastructures and traffic signals, the change of lanes of the drivers and their respects of norms. Moreover, the tool allows to run simulations at city level with tens of thou- sands of driver agents. We illustrate the use of this plug-in through an example for the traffic simulation of the Rouen city (France).