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Correct!

When is an articulated vehicle most at risk of jack-knifing?

When it's fitted with an endurance brake (retarder)
While it's manoeuvring slowly
While it's under heavy braking
Correct answer
When it's fully loaded

DVSA theory test explanation

Heavy braking can cause an articulated vehicle to become unstable and may even lead to jack-knifing; this is more likely to occur when the trailer is unladen.

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