A differential lock can help when a driven wheel loses traction on loose or slippery ground. The correct settings and engagement limits depend on the particular vehicle. Follow its handbook and training rather than treating the lock as a routine road-driving setting. Used at the wrong time, it can make steering more difficult and place unnecessary strain on the drivetrain.
Use it only where the vehicle manufacturer’s guidance allows and where extra traction is genuinely needed, such as low-grip ground at very low speed. Once traction is restored, disengage it as soon as it is safe to do so.
Key revision point: A differential lock is a traction aid, not a substitute for choosing the right speed and surface.
Further reading: Manufacturer traction-control overview.
Independent Driving Theory Test Channel revision material. Not affiliated with DVSA or DVLA.
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