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When it's fitted with an endurance brake (retarder)
When it's fully loaded
While it's manoeuvring slowly
While it's under heavy braking
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.
Category: Braking Systems
References: The Official DVSA Guide to Driving Goods Vehicles: Section 2
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