Drivers have been issued a warning ahead of a 10-second 'siren' taking place this weekend .
The UK Government will conduct a national test of the emergency alerts system at 3pm on Sunday, September 7.
Mobile phones and tablets connected to 4G or 5G internet should all emit a loud siren-like sound and vibrate for 10 seconds - even if they are set to silent.
Anyone who will be behind the wheel at the moment the alert takes place is being urged not to pick up their phone when it happens - but to stay calm and focus on driving.
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The AA says drivers should acknowledge the message when it's safe to do so, only responding to it when they have stopped in a safe place with the engine off.
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