No driver sets off wanting a speed ticket.

However, with so many speed cameras around, it’s easy to accidentally get flashed if you’re not closely watching your speed.

Knowing how average speed cameras work and what they look like can help you avoid fines and drive safely.

In this blog, we’ll cover everything you need to know about speed cameras in the UK.

How do average-speed cameras work?

Average speed cameras have systems that track how long a car travels between two set points on a road.

Two cameras at each point (at least 200m apart) calculate your speed. The first camera records your number plate, and the second registers how quickly you got from point A to B, which calculates your average speed.

The equation used is simple: Speed = Time/Distance.

So, at an average speed of 80 mph, it would take approximately 5.59 seconds to travel the 200 meters between the two cameras.

In other words, speeding up before the camera and then slowing down as you approach it won’t help, as your overall average speed will still exceed the limit.

Average speed cameras vs normal speed cameras

As explained above, average speed cameras monitor your speed over a set distance, calculating your average speed between two points. 

In contrast, normal speed cameras capture your speed at a single moment. 

Generally, average speed cameras are harder to avoid, promoting consistent speed limits and preventing accidents throughout the monitored area.

What do average speed cameras look like?

Average speed cameras are distinctively yellow and mounted on yellow poles. They also have the same shape as CCTV cameras.

These cameras are typically positioned at the side of the road, and are taller than normal fixed speed cameras.

Where are average speed cameras?

Average speed cameras are used on lots of roads, including dual carriageways, motorways, urban areas, and A roads.

Temporary average speed cameras can also be installed at roadworks with reduced speed limits, which will always be clearly signposted.

Average speed camera locations are marked by signs featuring an old-fashioned camera, also used for mobile speed checks and normal cameras. 

What are the average speed camera limits?

You can technically be prosecuted for exceeding the speed limit by just one mph. However, this is very unlikely.

There are rumours about speed camera tolerances. It’s true that some cameras allow leeway for car speedometer inaccuracies.

In reality, the amount of tolerance varies depending on the police force operating the camera.

Some police forces in the UK allow a tolerance of 10% + 2mph, meaning you’re safe up to 79mph in a 70mph zone. 

Remember this is not law, so sticking to the speed limit is the safest bet.

How can I avoid getting caught by average speed cameras?

There’s only one answer to this — and it’s by sticking to the legal speed limit. 

What happens if I’m caught by an average speed camera?

The penalty for being caught by an average-speed camera is the same as normal cameras: a £100 fine and three points on your licence.

The fine also increased based on how much over the limit you were speeding.

In some cases, speeding can result in up to six points and possible disqualification, with fines reaching £1,000 or £2,500 for motorway offences.

If you’re caught, a speeding ticket usually arrives within 14 days, starting with a Notice of Intended Prosecution (NIP) to confirm the driver, followed by the official ticket detailing the punishment.

False facts about average speed cameras

There are plenty of myths and legends about average speed cameras.

Don’t fall for fakes! Here are the facts you need to know:

• Speed cameras do work at night, thanks to infra-red technology
• Multiple penalties can happen in one place, as there can be multiple pairs of average speed cameras
• Modern speed cameras cover all lanes — changing won’t beat them

Top average speed camera FAQs

Can an average speed camera catch you on your phone?

No. While police are creating cameras that catch speeding and phones, these are normal units—not average speed cameras.

Do average speed cameras flash?

No. Average speed cameras don’t flash like normal fixed cameras. This is because they use infrared light rather than a photo to record your speed.

Are speed cameras always turned on?

More or less yes, average speed cameras are always turned on. The only time you’ll know one is off is if it has a sign saying ‘camera not in use.’

Do average speed cameras take photos of you?

No, average speed cameras don’t take photos of drivers. If you get caught, you instead have to fill out a form and declare who was driving at the time.

What do average speed camera signs look like?

Average speed camera signs have the standard camera picture, but they’ll also say ‘average speed check’ on the bottom.

Final thoughts

Average speed cameras might seem like a nuisance, but it’s critical to remember that they're there for your road safety. Stick to the speed limit, and you’ll be just fine!

Learn more via the Bumper blog.

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