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Second impact (safety)
The second impact (also known as ''second collision'' and ''human collision'') is the impact suffered between a vehicle occupant and the vehicle he or she is riding in during some kind of safety incident. The first impact is the impact between the vehicle and another object.〔(''A HALF CENTURY OF ATTEMPTS TO RE-SOLVE VEHICLE OCCUPANT SAFETY: UNDERSTANDING SEATBELT AND AIRBAG TECHNOLOGY''Page 1 )〕 There is also a third impact between the internal organs and the frame of the body.
The term was coined in the 1950s by Sergeant Elmer Paul of the Indiana State Police. Paul convinced Indiana authorities to investigate the mechanics of highway injuries, and worked with safety pioneer Hugh DeHaven.〔(PDF, page 138 )〕
The effects of the second impact are reduced by the use of seat belts, airbags, interior vehicle padding and removing of aggressive structures.〔(''A HALF CENTURY OF ATTEMPTS TO RE-SOLVE VEHICLE OCCUPANT SAFETY: UNDERSTANDING SEATBELT AND AIRBAG TECHNOLOGY'' PDF )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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