UK drivers with Stop-Start technology in their vehicles are being warned that they could face a fine of up to £1,000 if they are caught doing one thing.

Also known as Auto Start-Stop, the clever function automatically switches off the engine when the car comes to a complete stop (like at a red light) and restarts it smoothly when the driver is ready to move.

This feature is designed to reduce fuel consumption and emissions , especially during city driving where there are frequent stops.

Most cars with this system installed offer motorists the option of temporarily disabling it, a course of action many take because they find the function annoying or disruptive.

For those who avail of the brilliant piece of technology, there is one thing they must never do while the function is in oper

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