Revision question · Environmental issues

You expect a traffic queue to remain stationary for more than a couple of minutes. Why switch off the engine when safe and practical?

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

To keep your passengers cool

To save on vehicle air pressure

To reduce exhaust emissions

To reduce radio interference

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To reduce exhaust emissionsThis was the right answer

Apply the parking brake and switch off during a prolonged wait when safe and practical, reducing exhaust emissions and noise. This is not an instruction to stop essential systems at every brief halt; leaving the engine running while stationary in traffic is not automatically prohibited.

Reviewed reading for this question

Rule 123Highway Code rule · These are prolonged waits, not instructions to turn off essential equipment at every brief stop. Apply the parking brake and switch off when safe and practical; stationary traffic is not automatically an idling offence.

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