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Which four wheel steering behaviour applies at high speed?

  • A.The rear wheels steer through a larger angle than the front, which produces a very rapid change of direction
  • B.The rear wheels steer in the same direction as the front
  • C.The rear wheels steer opposite to the front, which tightens the turn and therefore improves the response markedly
  • D.The rear wheels remain straight

Answer: B

Same phase steering at speed makes the vehicle change lane by moving bodily sideways rather than by rotating, which is far more stable. Opposite phase at speed would be dangerously nervous. The threshold is typically around fifty kilometres per hour. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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