Question 106 of 140

What is a 'trailer swing' skid, and how does it differ from a tractor jackknife?

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It refers to a skid caused only by steering axle failure
It is simply another term for the exact same event as a tractor jackknife, just used a bit differently
It only happens when the trailer is empty
It is when the trailer itself skids sideways, sometimes due to trailer brakes locking, rather than the tractor's drive wheels

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Correct answer to question 106 (Combination Vehicles): It is when the trailer itself skids sideways, sometimes due to trailer brakes locking, rather than the tractor's drive wheels

Why

A trailer swing skid happens when the trailer's own wheels lose traction, often from locked trailer brakes, causing the trailer to swing out, which is a distinct mechanism from a tractor jackknife caused by the drive wheels.

Updated: November 2026

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What is a 'trailer swing' skid, and how does it differ from a tractor jackknife?

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