Active safety is a generic expression for any system which improves the vehicule behavior (braking, lightning, dynamic behavior, ...). But a specific system can be considered as an active safety system only if it spares lives or injuries. As the driver is one of the most important factors in crash impairement, the study of his (her) behavior must be taken into account when tuning a safety system.

Psychophysiological measurements are performed in order to test the efficiency of the safety system with ordinary drivers in real driving conditions. Stress, concentration, can be evaluated and it is possible to explain the difference of efficiency of a system within the driver. At last, the vehicule can be modified in order to be as efficient as possible for a larger population.

These techniques have already been used to evaluate the real efficiency of an ABS in emergency situation and in order to determine the influence of the dynamic behavior on driving.

Psychophysiological measurements are correlated with measurements on the car and informative results are presented for the described situations.