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Correct!

When is trailer swing most likely to occur on a lorry and drawbar combination?

While you're braking on a bend
Correct answer
While you're using an endurance brake
While you're steering at slow speed and fully loaded
While you're moving off at an angle

DVSA theory test explanation

The forces that act on your vehicle if you brake while cornering can lead to instability and may cause trailer swing. You should try to plan ahead so that you brake smoothly and in good time as you approach a bend.

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