Practice question

The towing motor vehicle has ABS but the trailer does not. What jack-knife risk does IAAA Theme 5 describe in an emergency stop?

  1. No danger exists, because the trailer always stops earlier than the tractor
  2. The trailer will pull the tractor backwards
  3. A danger of folding exists: the trailer will start pushing the tractor
  4. The tractor will automatically apply the trailer parking brake

Answer: C — A danger of folding exists: the trailer will start pushing the tractor

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