Side Impact Test
Compared to the NHTSA test rig, which simulates the impact from the front end of a passenger car, the taller IIHS test rig simulates the impact of an sport utility vehicle or Pickup truck (approximately a quarter of all new cars sold) into the side of the vehicle being tested. This is a very demanding test of both the vehicle's structural integrity and its side airbag systems, if any. (Seat belts play a less important role in side crashes on the impacted side of the vehicle.) While most new vehicles achieve 4–5 stars from the NHTSA (where head injuries are not part of the rating), many do not score well in the IIHS side impact test.
The IIHS assigns one the same "Good", "Acceptable", "Marginal", or "Poor" ratings to nine categories before deciding the vehicle's overall side impact score.
Read more about this topic: Insurance Institute For Highway Safety
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