The paper describes experiments involving restrained human volunteer tests in drop tests involving velocities up to 4.2 meters/sec.

The effect of roof crush on restrained occupants has often been discussed without regard to the headroom available, effectiveness of belts, and location of roof crush. In this paper the question of the ability to protect a simply restrained occupant in an environment in which the roof does not crush is addressed.

The results show that, with an effectively designed occupant rollover protection system, restrained occupants of various sizes do not experience serious injurious neck injuries without roof crush.

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