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Your vehicle is fitted with a 'diff-lock'. When would you normally use it?

While driving on muddy construction sites
Correct answer

DVSA explanation

The differential allows the drive wheels to rotate at different speeds; this is necessary for the vehicle to negotiate corners and bends. On a slippery surface, however, it can cause problems: if one wheel has less traction, it can spin, resulting in a complete loss of drive. The 'diff-lock' prevents the wheels from turning independently and so helps to stop this happening.

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