This report is a statistical evaluation of the fatality- and
injury-reducing effectiveness of the energy-absorbing materials in
vehicles without head-protection air bags. (NHTSA previously
evaluated the effectiveness of head-protection air bags in 2007.2)
In one sense, this report evaluates a specific technological
approach (energy-absorbing materials without air bags) that is
already phasing out. But the energy-absorbing materials,
themselves, will not be phasing out; they will continue to appear
in new vehicles to protect occupants in crashes where the air bags
do not deploy or perhaps at locations not covered by the air bags.
More generally, the report investigates whether a technology
demonstrated to have reduced HIC measured on headforms in
laboratory testing is likewise effective in reducing the head
injuries of people in crashes.
General
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