The central prerequisite both for the development of an empirically tested driver behaviour model and for the evaluation of advanced driver assistance systems (ADAS) is a differentiate knowledge of driver behaviour in different traffic situations and driver reaction to various warnings. The studies presented here contribute to the development of such an empirically validated model. Prototypically this is shown with differences in reaction and braking behaviour following no and different warnings in a pedestrian use case. To this aim four experimental studies were conducted and their methods and results are reported. In these studies various parameters of driving behaviour were assessed in critical and non-critical situations. The collected parameters comprise parameters of gaze, critical values of the optical variable τ for brake pedal and accelerator operation and values for visual perception, reaction base-time and motor reaction time. For these parameters characteristic values were assessed in laboratory and simulator studies. These values can further be used as baseline for future research. The values were tested and validated in an experimental real-car
study. In this study the effect of warnings on these perception and reaction parameters was assessed.