Drivers will see new warning message on UK motorways in less than 24 hours

Devices connected to 4G or 5G internet should all emit a loud siren-like sound and vibrate for 10 seconds

09:41, 06 Sep 2025

Drivers travelling across the UK's motorways this Sunday will see a new warning message displayed on gantries.

The message is expected to be displayed on motorways such as the M40 and M25, the Daily Express reports[1].

It will read, "PHONE ALERT TEST - 3PM" and "MOBILE PHONE ALERT TEST 3PM," according to National Highways.

This is to warn drivers of the emergency alert set to beam out of mobile phones and tablets.

Devices connected to 4G or 5G internet should all emit a loud siren-like sound and vibrate for 10 seconds.

The UK Government will conduct a national test of the emergency alerts system at 3pm on Sunday, September 7.

The alert will ring out on phones, even if they are set to silent, so drivers in particular are being urged to be ready for it to avoid being startled.

The AA advises drivers to 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.

AA president, Edmund King, stated: "We support the testing of the emergency alerts system, which is an important tool the government uses to keep people safe in a crisis.

"On the day, drivers should simply stay calm and focus on the road.

As always, only check your phone when you're parked safely with the engine turned off."

It is illegal to use a hand-held device while driving.

Motorists can be fined GBP200 and receive six penalty points.

The AA is recommending drivers familiarise themselves with the sound their devices will make ahead of Sunday.

This test is part of a nationwide effort to ensure the system works effectively in real emergencies, such as extreme storms or wildfires.

Pat McFadden, Chancellor of the Duchy of Lancaster, stated: "Over eight million people have already safely received emergency alerts in real life scenarios, including floods and extreme storms.

"Emergency alerts help us deliver lifesaving advice in an emergency, which is why it's so important we test the system, to make sure we can keep the country safe when lives are on the line."

References

1. ^ Daily Express reports (www.express.co.uk)
2. ^ HMRC sending new tax codes to anyone with these savings (www.birminghammail.co.uk)