In a traffic accident, scientific data are needed to refute the driver's false claim or statement that the shock was not recognized at the time of the accident. ISO2631 deals with methods and evaluation criteria for measuring human vibration of vehicle occupants. In this study, we tried to find out the characteristics of human body vibration transmitted to vehicle occupants on comfort. In evaluating the impact of unpaved roads or speed bumps on vehicle drivers in future traffic accident site investigation, it is expected that objective evaluation can be performed by utilizing the human vibration measurement method, evaluation criteria, and experimental values performed in this study.