Some speed cameras flash and some do not. An Ask the Police answer, produced by the Police National Legal Database (PNLD), says a Gatso camera, the type it calls the most commonly used on UK roads, takes two photographs of the rear of a vehicle over the limit with a high powered flash. Police Scotland says a Vector SR camera uses infra-red and needs no flash at all. A flash therefore proves little either way. If a camera recorded an offence, a notice follows, and Ask the Police says it must be served on the registered keeper within 14 days. This guide covers which cameras flash, why, and what the sources say a flash does and does not mean.
Which speed cameras flash?
The table puts each kind of camera next to what an official or police source says about its light. Where a page is silent, the table says so instead of guessing.
| Camera | What the source says about light |
|---|---|
| Gatso fixed camera | If the radar finds a vehicle over the limit, a camera and high powered flash take two rear photographs (Ask the Police). Police Scotland puts the interval at 0.5 seconds |
| Vector SR fixed camera | Infra-red, so images are captured without the need for camera flash (Police Scotland) |
| Average speed camera | Infra-red illuminators and cameras, working in all weather, 24 hours a day (National Highways, at roadworks) |
| Marked van with a laser unit | Laser detection and image recording (Police Scotland). The page does not say how the picture is lit |
| Red-light camera (Redspeed) | Loops under the road trigger two images (Police Scotland). Light not described |
| Motorway gantry (HADECS) | Two images when an offence is detected (Police Scotland). Light not described; see the self-check flash below |
The NPCC technical guide for police adds that police laser speedmeters use invisible infra-red light, which does not interfere with drivers' vision. That is the beam that reads your speed, not the camera that photographs you. How the sensors work covers the measuring side.
Does a speed camera flash when you are under the limit?
For a Gatso, the flash belongs to the photograph. The Ask the Police answer says that if a vehicle exceeds the limit for the road, the camera and flash take two pictures, and that they face the rear so the flash does not blind drivers. It ties the flash to a vehicle over the limit.
That is not proof that you were the vehicle. The NPCC guide says the use of dummy flash units should receive favourable consideration, because experience has shown they have a deterrent effect, and it notes that a visible camera housing also deters speeding. Version 1.2.1 of the guide dates from July 2016. What you see from the driver's seat, a housing or a flash, is not a record of what was captured.
Why a motorway camera can flash without an offence
On motorways with variable limits, National Highways says that when a speed limit or a closed lane signal changes, the enforcement device performs a self-check. Vehicles passing it may notice a flash, and National Highways says this does not necessarily indicate that your vehicle was identified as exceeding the displayed limit. The guide to motorway speed cameras explains the signs and the equipment.
No flash does not mean no record
The sources describe three ways to work without a visible burst of light. Police Scotland says Vector SR captures images without the need for camera flash. National Highways says its average speed cameras carry infra-red illuminators and work in all weather, 24 hours a day. The NPCC guide says police laser equipment uses invisible light. GoSafe adds that fixed and mobile safety cameras can operate 24 hours a day.
So neither a flash nor its absence confirms or rules out a record. An overview of all the kinds is in the four types of speed camera.
What a record leads to
Ask the Police says the police send a notice to the address where the vehicle is registered, and that it must be served on the registered keeper within 14 days. Section 1 of the Road Traffic Offenders Act 1988 sets the same fourteen days for a summons or notice of intended prosecution, with exceptions in section 2.
GOV.UK says that within 14 days of your car being caught speeding you are sent a Notice of Intended Prosecution and a Section 172 notice, and that the Section 172 notice must be returned within 28 days to say who was driving. The minimum penalty for speeding is a £100 fine and 3 penalty points, unless you are offered a speed awareness course. This is a summary, not legal advice.
What BlitzBuddy does about it
BlitzBuddy gives no speed camera warnings in the UK, Ireland or any other country outside the five where it warns; your speed, trips and reports from other drivers still work. Camera warnings switch on by themselves on arrival in the Netherlands, Belgium, Germany, France or Türkiye, where the cameras and the rules differ from the UK.
In Germany, § 23 (1c) StVO forbids drivers to use a speed camera warner while driving; the warnings can be switched off under Profile, Warnings, and the driver is responsible. In France, article R413-15 of the Code de la route punishes holding, carrying or using a device that can detect or disturb the equipment used to record traffic offences with a fifth-class fine and the loss of six points, and its paragraph V, added by a decree of 3 January 2012, extends this to devices or products meant to warn of or inform about the location of that equipment; using these warnings is the driver's own responsibility. Where speed camera warnings are allowed compares the countries.
BlitzBuddy is free, with no ads and no subscription. It is available for iPhone; the Android version is coming soon.
More guides on the same topic are collected under speed camera guides. The newest kind of camera, which looks into the car, is in AI cameras for phones and seat belts.
Sources
- Can you tell me about the different types of speed camera most commonly used in the UK?, Ask the Police (Police National Legal Database), on the West Yorkshire Police website, read October 2026
- A speed camera has flashed me, when will I know if I am going to get a ticket?, Ask the Police (Police National Legal Database), on the West Yorkshire Police website, read October 2026
- Camera Type, Police Scotland Safety Cameras
- Variable speed limits, National Highways
- Average speed enforcement cameras around roadworks, National Highways
- Guide for the operational use of speed and red-light offence detection technology, version 1.2.1, National Police Chiefs' Council, July 2016 (pdf)
- FAQs, GoSafe
- Speeding penalties, GOV.UK
- Road Traffic Offenders Act 1988, section 1, legislation.gov.uk
- Straßenverkehrs-Ordnung, § 23, Federal Ministry of Justice (in German)
- Commentaire de la décision n° 2021-948 QPC, Conseil constitutionnel (in French; quotes article R413-15)
- Permis de conduire : barème des points retirés par infraction, Service-Public (in French, verified 27 February 2026)
Sources read on 16 October 2026.
Frequently asked questions
Do speed cameras flash?
Some do. An Ask the Police answer by the Police National Legal Database says a Gatso camera uses a high powered flash when it photographs the rear of a vehicle over the limit. Police Scotland says Vector SR cameras use infra-red and need no camera flash.
Does a speed camera flash at night?
Cameras work at night. GoSafe says fixed and mobile safety cameras can operate 24 hours a day, and National Highways says its average speed cameras have infra-red illuminators so they work in all weather, 24 hours a day. Whether you see a flash depends on the kind of camera.
What if a speed camera flashed me?
A flash does not confirm anything. Ask the Police says the police must serve the notice on the registered keeper within 14 days, at the address where the vehicle is registered, and GOV.UK says it comes with a Section 172 notice asking who was driving.
Does an average speed camera flash?
National Highways describes its average speed cameras as painted yellow and equipped with infra-red illuminators and cameras. Its page does not describe a visible flash.
Why did a motorway camera flash when I was not speeding?
National Highways says that when a variable speed limit or a closed lane signal changes, the enforcement equipment runs a self-check and passing vehicles may see a flash. It adds that this does not necessarily mean your vehicle was identified as exceeding the limit.
