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Whether you're driving through motorway roadworks or cruising down dual carriageways, these silent enforcers track your speed over distance, unlike traditional flash cameras that catch you in an instant.
In this guide, we explain how average speed cameras work, where you’ll find them, and what to expect if you're caught speeding.
What are average speed cameras?
Unlike standard fixed cameras like the well-known Gatso, which record your speed at a single point, average speed cameras monitor how long it takes you to travel between two points or more along a stretch of road.
These cameras are typically mounted high up on yellow poles, earning them the nickname "yellow vultures". They’re designed to encourage consistent, safe driving – not sudden braking.
How do average speed cameras calculate your speed?
The system is surprisingly straightforward. Each camera records your vehicle registration plate using Automatic Number Plate Recognition (ANPR) technology. By logging the exact time you pass each camera, the system uses the simple formula:
Speed = Distance ÷ Time
To be effective, the cameras need at least two fixed points, often placed several hundred metres apart. If your calculated speed exceeds the limit for that road, you're flagged automatically.
Do average speed cameras work at night or in bad weather?
Yes, they do. These cameras use infrared technology, which allows them to capture number plates even in low light, fog, or rain. Unlike flash cameras, there’s no visible flash, so drivers often don’t realise they’ve been caught until a notice arrives in the post.
Can you avoid them by changing lanes?
This is one of the most common myths. On older systems, switching lanes sometimes disrupted the ability to track a car’s full journey, but modern average speed cameras track across multiple lanes and share data between cameras.
So, changing lanes won't help you avoid detection.
Where are average speed cameras used in the UK?
You're most likely to spot average speed cameras on motorways and A-roads, particularly through roadworks or along long stretches known for speeding. Some urban routes also use them, as city councils look to improve safety in residential areas with traffic-calming measures. Smart motorways often incorporate average speed systems too, working alongside variable speed limits and lane control.
While they were once mainly seen in temporary roadworks zones, these average speed cameras are now increasingly used as a permanent enforcement solution across the UK.
What happens if you're caught speeding?
If you're found to be over the limit, you'll receive a Notice of Intended Prosecution (NIP) by post. This typically arrives within 14 days.
Penalties include:
- £100 fine and 3 points on your licence (standard penalty)
- Speed awareness course (offered in some cases instead of points)
Heavier penalties for excessive speeding include:
- Up to 6 points
- A driving ban
- Fines up to £1,000 (or £2,500 on motorways)
Are average speed cameras always switched on?
Most systems are live 24/7, especially in areas with temporary speed limits, like roadworks. Signage will indicate when they're in use. That said, it’s best to assume that if you see them, they're active.
Final thoughts: drive smoothly, not suddenly
Average speed cameras aren't about catching you out – they’re designed to promote safer, more consistent driving habits. There's no point slamming on the brakes as you approach one; it’s the journey between the cameras that counts.
As more systems roll out across the UK, understanding how they work is key to staying safe on the road.
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