This paper proposes a simulation platform dedicated to test and validate methodologies that can be able to bring potential solutions for level crossings safety in terms of infrastructure organization and intelligent video surveillance. The development of this platform is in its beginning and the main objectives are precise 3D virtual universe modeling and visualization, video sensors positioning, scenarios simulation and user interaction. The first results in terms of 3D virtual universe modeling/visualization and scenarios simulation are presented in the framework of the PANsafer project (Towards a safer level crossing), supported by the French National Research Agency.