Traffic light cameras: what you need to know

Consumer Editor

8 minute read|26th Aug 2026

Traffic light or red light cameras at busy junctions play a vital role in keeping our roads safe. But if you’ve accidentally run a red light, it may not be clear whether or not you’ve been caught.

A common sight on UK road for over 20 years, traffic light cameras are designed to enforce some of the most important rules of the road and discourage people from driving through red lights. And if you've been caught by a red light camera, you may face a fine or points on your driving licence.

Here we’ll cover what you need to know – from what triggers the cameras, to what to do if you think you’ve been snapped.

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Traffic light camera facts

Question	Answer
Do all traffic lights have cameras?	No. Traffic light cameras are typically installed at busier junctions, accident hotspots and locations where red-light offences are a known problem. However, you should always stick to the rules of the road, no matter if there is a camera or not.
Do all traffic light cameras flash?	No. Some traffic light cameras produce a visible flash when triggered, while others use digital technology and may not be obvious to drivers.
Will I get points for driving through a red light?	If you are caught crossing the stop line after the lights have turned red, the usual penalty is a £100 fine and three penalty points on your licence. This can be more if your case is referred to the court system.
What is the typical traffic fine for running a red light?	Most drivers caught running a red light can expect a Fixed Penalty Notice of £100 and three penalty points, although more serious cases may be dealt with in court.

How do red light traffic cameras work?

Modern traffic light cameras are capable of identifying vehicles that ignore red lights and/or exceed the speed limit.

The camera does this by using radar and/or sensors or ground loops embedded in the road.

It’s an offence for any part of your vehicle to pass the white stop line if a traffic light has turned red. It is also an offence to exceed the speed limit when passing a traffic light.

Some traffic light cameras may give you a small grace period (less than half a second)* after the red light appears, while others will take a photo immediately.

All traffic light cameras are designed to improve road safety and the vast majority of red light cameras in the UK are made by Gatsometer.

These Gatso RLC 36 units also have built-in radar technology, with dual speed and red light functions, so for the sake of safety and the law, avoid the temptation to put your foot down when they start to change.

Although many drivers associate traffic light cameras with the sensor loops sometimes visible in the road, modern enforcement systems can work in several different ways.

Older cameras often use loops embedded in the carriageway to detect vehicles crossing the stop line, while newer digital cameras may use radar, video analytics and number plate recognition technology.

As a result, some traffic light cameras can operate without any visible sensors in the road.

^{*Some camera systems may not activate the instant the signal changes to red, but drivers should never rely on any grace period and must stop when the light changes.}

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Does every traffic light have a camera?

No, but they are quite common. Usually bigger and busier junctions have red light cameras; if a junction is a bit of an accident-prone area, then they're more likely to be installed as well.

The best advice is just to treat every junction as if there are cameras, and be careful not to disobey the lights or drive over the white lines.

Why do we need red light cameras?

All traffic light cameras are there for our safety. They’re typically installed in high-risk areas, perhaps where someone has previously been injured or an accident has occurred after a red light was run.

At busy junctions and crossings you’ll often also see smaller cameras on top of the lights themselves. These are there to help monitor traffic and congestion on roads, but do not flash for driving offences.

Do temporary traffic lights have cameras?

Many temporary traffic lights have cameras to detect vehicles that pass the white stop line after the light has turned red.

Temporary traffic light cameras are put in place to protect drivers and the people who may be undertaking the road works.

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Do traffic light cameras flash?

There’s no guarantee you’ll know you’ve been caught immediately, unless the camera unmistakably flashes.

But traffic light cameras don’t always flash like Gatsometer’s more common yellow box speed cameras, so it can be tricky to judge if you made it through in time.

While Gatsometer cameras will produce a distinctive flash whenever taking a photo, newer versions of the Trevulo-D speed cameras – which can also double up as red light cameras – use an infra-red flash which isn’t visible to the driver.

If your car is captured by either, you’ll receive a Notice of Intended Prosecution (NIP) within 14 days, once the photo has been reviewed.

What happens if you've been caught by a traffic light camera?

It is an offence to pass the white stop line when the traffic light has turned red or amber. If prosecuted, you will face 3 penalty points and a fine for failing to comply with a red light signal.

A Notice of Intended Prosecution (NIP) will be sent to the registered owner of the vehicle, asking them to name the offending driver within 28 days.

In most cases, the notice will ask for an admission of guilt and order the payment of a fixed penalty fine in place of taking the case to court.

You’ll also have the right to appeal a penalty notice if you feel you had mitigating circumstances for running a red light.

What defence can I use to challenge a red light offence?

In all likelihood, very few. As a ‘strict liability’ offence, you won’t get away with simply insisting you ‘didn’t intend’ to run the light, if photographic evidence proves you did.

The only circumstances which may offer a defence include:

Proving you did not go through the red light
Proving there was a defect with the light or related signage

Further, special reasons may also be considered by a court and lead to a re-assessment of your punishment.

However, it is unlikely you will be let off for allowing an emergency vehicle to pass.

What's the penalty for running a red light?

Aside from the most important cost – the safety of you and other road users – if caught running a red light you’ll be required to pay a fine.

The current penalty for failing to stop for a red light is usually an £100 fine and three points on your licence. The points will stay on record for four years.

If you fail to sign or respond to a NIP, or provide the details of the correct offending driver if disputed, you could face prosecution, six penalty points and a maximum fine of £1000.

Most constabularies also offer educational courses to motorists who are caught running a red light.

More serious cases may be referred to court where higher fines and additional penalties can apply.

Do you always get points for running a red light?

Three penalty points will usually be imposed on your driving licence if you have failed to comply with a red traffic light signal. However, if the police deem the matter to be particularly serious or dangerous, you may be required to go to court.

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Traffic light camera penalties

Offence	Typical Penalty	Explanation
Running a red light	£100 fine and 3 penalty points	Drivers who cross the stop line after the traffic signal has turned red can usually expect a Fixed Penalty Notice and three points on their licence.
Serious red-light offence	Court summons	More serious cases, such as dangerous driving, causing a collision, or repeatedly ignoring traffic signals, may be referred to court where higher penalties can be imposed.
Failing to identify the driver	Larger fine and points possible	If the registered keeper does not respond to a Notice of Intended Prosecution or fails to identify who was driving, they can face a separate offence carrying a larger fine and additional penalty points.

What is a Notice of Intended Prosecution (NIP)?

A Notice of Intended Prosecution (NIP) is a formal notice sent by the police to inform a driver or vehicle keeper that they may be prosecuted for a road traffic offence, such as running a red light or speeding.

This doesn't mean you will be automatically prosecuted, but it serves as a warning that legal action is being considered.

Can I go through an amber light?

It is legal to cross the white line on an amber traffic light if stopping safely would be impossible. The Highway Code allows drivers to proceed when braking suddenly could create a danger.

The Highway Code states that drivers should stop at an amber light unless they have already crossed the stop line or are so close to it that stopping could cause a collision. In other words, an amber light means stop in most circumstances, rather than start accelerating.

If it is safe to stop, you should do so. However, a driver is not expected to brake harshly if doing so would create a danger for themselves or other road users.

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How do I know if I was caught by a red light camera?

It can be very difficult to know if you have been caught by a traffic camera. This is because it is not always obvious if a traffic light camera has recorded an offence.

Some traffic light cameras produce a visible flash when triggered, while others use digital technology that may not be noticeable to drivers.

Even if you do not see a flash, this does not necessarily mean you have not been detected.

If a camera records an alleged offence, the registered keeper of the vehicle may receive a Notice of Intended Prosecution (NIP) through the post.

What happens after a traffic light offence?

If a traffic light camera captures an alleged offence, the police may send a Notice of Intended Prosecution (NIP) to the registered keeper of the vehicle.

The recipient will normally need to identify who was driving at the time of the incident.

For most red-light offences, drivers can expect a Fixed Penalty Notice carrying a £100 fine and three penalty points.

More serious offences, particularly those involving dangerous driving or collisions, may be referred to court where higher fines, additional penalty points or a driving disqualification could be imposed.

This will also likely include a court summons.

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