General rules, techniques and advice for all drivers and riders•Rule 123
Avoid Idling Your Car Engine
This rule is a legal requirement
The Driver and the Environment. You MUST NOT leave a parked vehicle unattended with the engine running or leave a vehicle engine running unnecessarily while that vehicle is stationary on a public road. Generally, if the vehicle is stationary and is likely to remain so for more than a couple of minutes, you should apply the parking brake and switch off the engine to reduce emissions and noise pollution. However it is permissible to leave the engine running if the vehicle is stationary in traffic or for diagnosing faults.
💡Example
Turn off your engine when your car is parked or stationary for more than a couple of minutes to help reduce emissions and noise pollution. For instance, if you're parked outside a shop waiting for someone, switch off the engine instead of leaving it running.
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