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The objective of this study was to evaluate the performance of various configurations of a driver restraint system by using a combined injury criteria index and making the restraint system adaptive to different frontal crash coinditions, such as severity of the crash, belt use, sitting position, pre-impact braking and size of the driver. For this purpose, a mathematical model of a driver restraint system was developed. The study was divided into three steps: 1. A FE-model of the driver airbag was developed by using MADYMO 3D program; 2. The model was validated by comparing the simulations to crash tests; 3. Effects of design changes in an adaptive restraint system on injury parameters were investigated in simulations of frontal car impacts. It was found that the performance of the restraint system was most influenced by the size of the ventilation hole and the capacity of the gas generator.