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Which safety feature does a modern steering column include?

  • A.An energy absorbing steering wheel rim, which deforms under the weight of the driver during a frontal impact
  • B.A collapsible section that shortens in an impact
  • C.A rigid shaft of the greatest possible strength, which prevents the column from being displaced during a collision
  • D.A locking mechanism

Answer: B

A mesh or ball bearing section collapses under axial load, preventing the column from being driven back into the driver during a frontal impact. The airbag works in conjunction with it. Before its introduction the column was a notorious cause of chest injury. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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