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Contemporary vehicles have to satisfy high ride comfort criteria. In order to determine appropriate human body model in driving condition field and laboratory investigations on passenger cars have been performed. In field research, dominant vibrations loading of passenger was determined by variance analysis of experimental results. The highest loading is in vertical and the lowest is in lateral direction. These results were base for further laboratory investigations. Group of thirty volunteer subjects was tested. We examined the influence of broadband random vibrations on human body behavior by Seat To Head Transmissibility (STHT) function. The influence of vertical and fore and aft vibrations on occupants were examined separately. In addition to, the influence of multi directional vibration was investigated.