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Driving Theory 4 All

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Your lorry is stuck in snow. You use the diff-lock to move off. When should you switch the diff-lock off?

As soon as the vehicle is moving
Correct answer

DVSA explanation

You must always disengage the diff-lock as soon as the vehicle is moving. The differential allows the rear wheels to revolve at different speeds, and this allows the vehicle to follow a curved path. Attempting to turn with the diff-lock engaged could result in the vehicle continuing straight on.

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