Microscopic traffic models describe the individual elements of transportation system, such as the motion of individual vehicle. In this paper, MovSim, an open-source tool for model investigation and simulation, is used and upgraded as a comprehensive tool for building microscopic traffic models. The upgraded simulator allows the construction of complex road networks with many junctions and roads with various traffic signalization and regime. In addition, road network editor is implemented in order to allow easy and user friendly road network reconstruction.