Improvements in frontal belted car occupant protection are the first priority in passive safety.
Passenger compartment intrusion is considered by some as one of the main limiting factors of belt eflcctiveness.
It is proposed to examine the effect of different amounts of intrusion (at the dashboard level but also at the footwell level) on overall severity of injuries ,but also in order to point out the balancing effect between intrusion and acceleration.
The most effective protection of vehicle occupants can only be based on the analysis of real world crashes. This analysis concerns the intrusion but also the overlaps observed in frontal impact for thc restrained front belted occupants and uses two sources :