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RAC Says Using Car's Air Con to Stay Cool Could See You Fined £110
RAC says idling engines can trigger £40 to £110 penalties as officials warn the practice adds air pollution during extreme heat.
Drivers seeking to cool down by sitting in stationary vehicles with air conditioning during the heatwave risk fines for breaking emissions laws, the RAC warns. Officials advise delaying non-essential trips until extreme conditions pass.
Rule 123 of the Highway Code states drivers must not leave engines running unnecessarily while stationary on public roads. Motorists should apply the parking brake and switch off the engine if stopped for more than a couple of minutes.
Standard penalties are £40 if caught by a police officer or £80 from a civil enforcement officer, with both amounts halved for prompt payment. Some authorities, including Islington Council in London, impose larger fines of £110.
Starting September 30, 2026, the Welsh Government will increase fines to £75–£150, citing air and noise pollution harmful to public health. Officials especially highlight risks to children and vulnerable people.
Although enforcement officers may apply leniency during extreme temperatures, idling remains an offence under emissions law. The Met Office warns that extreme heat continues causing significant disruption across England and Wales, impacting power and water supplies.