Revision question · Vehicle weights and dimensions

How does a conventional diesel speed limiter that regulates engine power normally limit the vehicle’s driven speed?

Revision material from the imported DVSA bank includes source-checked Lanekind learning corrections. These corrections are not newly issued official examination questions, and practice does not reproduce a live test paper.

Answer options

By applying the service brake

By applying the secondary brake

By reducing the fuel supplied to the engine

By changing to a lower or higher gear

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By reducing the fuel supplied to the engineThis was the right answer

It reduces fuel supply to restrict engine power. This describes a conventional diesel arrangement, not every modern assistance system. It does not replace the driver’s responsibility for downhill speed, lower road limits or safe overtaking.

Reviewed reading for this question

Understand a fuel-regulating diesel limiterReviewed guidance summary · The revised prompt limits the mechanism to a conventional diesel power-regulating arrangement.

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