It is becoming apparent that some safety devices are performing their desired function rather well while others are not. The one quality that all the better designs have is they require no action on the part of the occupant to perform their safety function in the event of a crash, that is, they are passive. Presently, the most viable passive restraint is the air bag. It inherently offers convenience and reliability characteristics which will appeal to the general public. Active restraints, such as the adjustable head restraint, ignition-interlock and lap/shoulder belt have consistently shown by their usage figures that they are unacceptable to the public.