UK motorists could face £20 spot fines if they leave their engines running while stuck in traffic. In a bid to cut down pollution, a pilot scheme is due to be launched in January in West Sussex, and will be expanded if it proves successful. Areas to be targeted are those where exhaust emissions build up unnecessarily, such as rail crossings and town centers.
The AA pointed out that to switch off an engine and start up again within a minute actually uses more fuel than letting it idle. A burst of fuel is needed to start an engine, so switching it off and then on again seconds later actually uses more fuel than idling and produces more emissions.
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