Practice question

What is "trailer swing" (or jack-knife risk) on an articulated vehicle?

  1. The trailer moving out of line with the prime mover, especially under braking or on slippery surfaces
  2. Normal off-tracking on a wide turn
  3. The trailer tyres wearing unevenly
  4. Automatic trailer steering

Answer: A — The trailer moving out of line with the prime mover, especially under braking or on slippery surfaces

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