Practice question

What is the 'crack-the-whip' effect in multi-trailer combination vehicles or articulated trucks?

  1. The driver cracking a leather whip out the window
  2. Rearward amplification: small rapid steering movements at the front tractor are magnified significantly at the rear trailer, causing the rear trailer to whip sideways or roll over
  3. The sound of air compressor valves discharging
  4. Engine exhaust backfire under hard acceleration

Answer: B — Rearward amplification: small rapid steering movements at the front tractor are magnified significantly at the rear trailer, causing the rear trailer to whip sideways or roll over

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