‘Silent’ speed cameras that don’t flash

Drivers were warned that some cameras don't give any sign they've been triggered - until you're served with a fine or points

Sonia Sharma Multi-Media Journalist and Andrew Nuttall U35 Lifestyle Writer 11:37, 30 Jul 2025

A motoring expert has warned drivers[1] they've probably not gotten away with speeding - even if the camera you passed didn't flash. They explain the truth about speed cameras and how they might now operate in a more 'silent' way.

With almost 350 deaths occurring every year on British roads[2], speed monitoring remains a crucial part of how the police keep our roads safe for everyone.

Car valuation experts at BigWantsYourCar.com[3] are now reminding motorists against relying on motoring myths or guesswork about speed restrictions, reports the Mirror[4].

A company spokesperson said: "We regularly speak with drivers who think there's a guaranteed buffer. But the truth is, as soon as you exceed the speed limit, you're technically breaking the law[5]."

How do speed cameras work?

Speed detection devices use radar technology or road markings to measure vehicle speed and document any faults. While earlier models relied on film, most modern equipment is entirely digital and can monitor your average pace over considerable distances

"Not all cameras flash anymore," the BigWantsYourCar.com[6] specialist clarifies. "Some operate silently, and some mobile units are manually operated - so relying on a flash as a warning is a risky game." Occasionally, they even photograph the driver and any passengers clearly.

These electronic systems document:

• Vehicle speed
• Time and location of the offence
• Vehicle registration
• Road speed limit

What speed activates a camera?

A spokesperson clarified that there is no legal "10% rule" for speeding, putting an end to a common motoring myth. "The idea that you're safe doing 35mph in a 30 zone is one of the biggest myths we hear.

Technically, you're liable for a fine the moment you go even 1mph over the limit."

Although the National Police Chiefs' Council (NPCC) does recommend a "10% plus 2" threshold for police discretion, it's not there in law and can vary by location or officer. The type of speed camera also plays a role in enforcement.

Fixed cameras operate on a set trigger speed, which is typically kept under wraps, while mobile cameras are manually operated, leaving more room for officer judgement based on the severity of the speed breach and context.

According to Confused.com[7], average speed cameras are different to normal fixed and mobile speed cameras. Average speed cameras check your speed over several miles, rather than measuring your speed over a short distance.

This means they should be more accurate and so might not have the same tolerance levels as other speed cameras.

The spokesperson from BigWantsYourCar.com[8] highlighted the unpredictability of mobile units: "Mobile speed units are particularly unpredictable. They're frequently set up in areas known for accidents, leading officers to adopt a stricter approach."

With consequences for speeding ranging from fines to points on your licence or even court summons, the advice from BigWantsYourCar.com is unequivocal. They advise motorists, "Don't gamble with the grey area," stressing that any speed over the limit could jeopardise your driving privileges, insurance, and safety.

If you're even slightly over the limit, you're putting your licence, insurance, and safety at risk.

No journey is worth that."

References

1. ^ drivers (www.dailystar.co.uk)
2. ^ With almost 350 deaths occurring every year on British roads (www.dailystar.co.uk)
3. ^ BigWantsYourCar.com (bigwantsyourcar.com)
4. ^ the Mirror (www.mirror.co.uk)
5. ^ technically breaking the law (www.dailystar.co.uk)
6. ^ BigWantsYourCar.com (bigwantsyourcar.com)
7. ^ According to Confused.com (www.confused.com)
8. ^ BigWantsYourCar.com (bigwantsyourcar.com)