Rule 123 of The Highway Code looks at ‘The Driver and the Environment’. It states that drivers must not leave a parked vehicle unattended with the engine running or leave a vehicle engine running unnecessarily while the vehicle is stationary on a public road.
Some local authorities charge a £20 fixed penalty notice (FPN) for emission offences and stationary idling under The Road Traffic (Vehicle Emissions) (Fixed Penalty) (England) Regulations 2002. There is potential for the fine to increase to £80.
However, fines can only be imposed if a motorist refuses to switch off their engine when asked to do so by an authorised person.
Most modern vehicles have ‘stop-start’ systems fitted that automatically switch off the engine when the vehicle is stationary and restart it as soon as the accelerator is pressed. Manufacturers allow this feature to be manually switched off, but motorists should not do this. There is no risk to your vehicle in allowing this feature to be left on.
For vehicles without ‘stop-start’ it is fine to turn off your engine, but you should try to avoid doing this repeatedly in a short space of time. In addition, older vehicles (around eight years old) and vehicles with older batteries (around five years old) may struggle if started too often in a short space of time.








