en دینامیک خودرو Vehicle dynamics, transmission پژوهشي Research Heavy articulated vehicles have low performance with respect to stability analysis due to their multifaceted geometry and dynamics especially when it comes to non-linear maneuvers. In this study in order to find out which statistical and dynamical factors have the most effect on stability of this type of vehicle without getting involve with their complex mathematical theory, combination of drive simulation and Taguchi method is used. Since the number and variety of factors are extensive, multi-step Taguchi method used. This method applied on values of modified rearward amplifications of each units of vehicle as a criterion of  lateral stability. Results show the high effect of suspension and load geometry of Vehicle Units on lateral stability and safety. Lateral Stability,Rearward Amplification, Articulated Vehicles, Drive Simulation, Taguchi Method, TruckSim 3110 3124 http://ase.iust.ac.ir/browse.php?a_code=A-10-355-2&slc_lang=en&sid=1 Sina Sadeghi Namaghi sinasadeghi@programmer.net 180031947532846002471 180031947532846002471 Yes Department of Mechanic, Engineering Faculty, Ferdowsi University of Mashhad Nima Sadeghi Namaghi nimasadeghi@mail.com 180031947532846002472 180031947532846002472 No Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad,