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Which structural element resists intrusion in a side impact?

  • A.The bumper beam
  • B.The roof rails, which transmit the load from the impact across to the opposite side of the vehicle structure
  • C.The B pillar and the door beams
  • D.The front crumple zone, which absorbs the energy of the impact before it reaches the passenger compartment

Answer: C

A side impact offers almost no crush distance, so the strategy is resistance rather than absorption, using very high strength B pillars, door intrusion beams and a strong floor cross member. Side airbags then manage the occupant. Roof rails and the floor structure do distribute the load, which makes the last option a genuine contributor rather than a wrong answer. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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