How AI Roadside Cameras Catch Phone and Seatbelt Offences, and Who Checks Each Image
Police in England now use roadside cameras that screen passing vehicles for handheld phone use and unworn seatbelts. The AI discards most images and flags the rest, but people confirm every offence before any notice is sent. Here is the pipeline, stage by stage, and what the published figures do and don't show.
Checked against Devon & Cornwall Police's Plymouth camera announcement (2026), reporting on Suffolk Constabulary's July 2026 deployment, and Acusensus's Heads-Up pages
Role scorecard
Police and Sheriff's Patrol Officers SOC 33-3051.00
- Core tasks AI does in production0 of 3
- Most mature evidenceIn production
- CostNot disclosed; the Plymouth trial's set-up costs were met by the supplier (police-stated)
- BenefitPolice credit "a significant reduction" in offences at sites, no figures (police-stated)
As of · Tasks: O*NET 31.01
| Core task (O*NET) | What AI or robots do | Extent | Evidence grade | Example case | Source |
|---|---|---|---|---|---|
| Monitor traffic to ensure motorists observe traffic regulations and exhibit safe driving procedures. | Cameras check every vehicle in the enforced lanes for handheld phone use and unworn seatbelts and flag possible offences; people confirm each one | Assists | In production | Acusensus Heads-Up cameras used across Devon and Cornwall for four years (police-stated) | 2 |
| Drive vehicles or patrol specific areas to detect law violators, issue citations, and make arrests. | A fixed or trailer-mounted camera detects violations at one site without a patrol; a notice of intended prosecution follows human review. No stops or arrests | Assists | Pilot | Jenoptik two-camera system on Gdynia Way, Plymouth, on a supplier-funded trial | 2 |
| Record facts to prepare reports that document incidents and activities. | The system saves photographic evidence of each flagged vehicle for the review team; images of vehicles that comply are not retained | Assists | In production | Devon and Cornwall Police, Plymouth (images of complying vehicles are not retained) | 2, 3 |
Extent and grade follow our evidence grades: "Does it" needs a production case where AI performs the task on its own; "Assists" means AI helps a person do it. Every case here is "Assists" because the forces say a person reviews every flagged image before any notice. Grades are from the police forces' own statements; the Suffolk deployment is described by a trade outlet as a pilot and is not graded here. We show three of the 31 core tasks O*NET lists for patrol officers; the others (arrests, emergencies, interviews, court work) have no camera case.123
Costs and benefits
| Camera cost | Not disclosed. Devon and Cornwall Police say the Plymouth system is on a trial basis with installation and set-up costs met by the supplier, Jenoptik (police-stated)2 |
|---|---|
| Outcome for a driver | An education course or a fine and penalty points (Devon and Cornwall Police); for not wearing a seat belt, a fine of up to £500 (GOV.UK)24 |
| Stated effect | The cameras are "credited with driving a significant reduction" in phone and seatbelt offences at various locations; no figures given (police-stated)2 |
As of · Sources: police forces, a trade outlet and the supplier235
| Stage | Done by | What happens | Stated by | Source |
|---|---|---|---|---|
| 1 Capture | Cameras | Trailer-mounted or fixed units take high-definition images through windscreens, with infrared flash, in any light or weather, from two angles (Suffolk coverage). Plymouth's Jenoptik system uses front-facing and overhead cameras | Suffolk Constabulary (via Kurrant); Devon and Cornwall Police | 3, 2 |
| 2 AI screening | Software | AI algorithms screen the images in real time and discard the majority automatically because they show no evidence of an offence; the rest are flagged as possible offences | Suffolk Constabulary (via Kurrant); Devon and Cornwall Police; Acusensus (vendor) | 3, 2, 5 |
| 3 Human review | Trained assessors | Flagged images are reviewed by at least two trained assessors (Suffolk); Devon and Cornwall say flagged images are reviewed by a human. The supplier says images sent for review are anonymised | Suffolk Constabulary (via Kurrant); Devon and Cornwall Police; Acusensus (vendor) | 3, 2, 6 |
| 4 Police check | Police team | In Suffolk, cleared images go into the force's existing camera-enforcement system for a further case-by-case review by a dedicated police team | Suffolk Constabulary (via Kurrant) | 3 |
| 5 Outcome | Police force | If an offence is correctly identified, the driver is sent a notice of intended prosecution (Devon and Cornwall). Suffolk says it prefers an education course where the driver is eligible; otherwise a fine, with penalty points possible | Devon and Cornwall Police; Suffolk Constabulary (via Kurrant) | 2, 3 |
Forces do not all run the same process. The stages are from Devon and Cornwall Police (a primary page), Suffolk Constabulary as reported by Kurrant, a smart-city trade outlet (a secondary source: the Suffolk force's own page could not be opened), and the supplier Acusensus, whose statements are vendor claims. Sussex Police's page was blocked from our tools, so we do not rely on it.
How it works
What the cameras are
Two systems are named in the forces' statements. Acusensus's Heads-Up, which the supplier says detects illegal mobile phone use and seatbelt non-compliance, can be fixed or trailer-based, and "operates autonomously to capture photographic evidence".5 Devon and Cornwall Police say Heads-Up cameras have been used throughout the force area over the past four years, and in Plymouth it is trialling a similar two-camera system from Jenoptik, positioned on Gdynia Way within an average-speed monitoring area where there were almost 30 collisions between 2020 and 2024.2 In the UK, Acusensus says nearly half of all police forces have operated Heads-Up in trials or enforced programs.7
What the AI decides, and what it doesn't
The AI's job is screening. It looks at every vehicle in the enforced lanes, discards the large majority of images that show no sign of an offence, and passes the rest on as possible offences.35 It does not issue anything. Devon and Cornwall Police put it plainly: "although the cameras use AI to detect potential offences, these images are subsequently reviewed by a human."2 The supplier calls this a combination of an "advanced automated recognition system, combined with human review" that it says "eliminates false positives while minimising the number of true offences discarded", a vendor claim; we found no independently published false-positive rate.5
Who checks each image
Suffolk Constabulary, as reported, has flagged images reviewed by at least two trained assessors, then a further case-by-case review by a dedicated police team in its existing camera-enforcement system.3 The supplier says images sent for review are anonymised.6 If the offence is confirmed, the driver is sent a notice of intended prosecution, according to Devon and Cornwall Police.2
What happens to images
Devon and Cornwall Police say images of complying vehicles are not retained.2 Suffolk is reported to delete automatically, in real time, images that show no potential offence, never viewed by a person, to crop and anonymise those selected for review, and not to use facial recognition.3 The supplier says data for non-offending drivers is deleted in near real time at the roadside and that offence data is encrypted so that only the customer can open it.6 These are statements by the force, its reporter and the supplier; we have not seen an independent audit.
What the figures show
Devon and Cornwall Police say that "less than 1% of the vehicles we monitored using the Acusensus cameras were detected committing offences".2 Suffolk coverage cites an earlier fixed-camera trial on the M4 in Berkshire in 2021 that recorded almost 7,000 seatbelt offences and more than 25,000 instances of handheld phone use over six months.3 Both are counts of detections, which are not the same as confirmed prosecutions, and neither says how many flagged images the reviewers rejected. Police point to a link to casualties: Devon and Cornwall say around a third of all fatal collisions nationally involve someone not wearing a seatbelt.2
The rules the cameras enforce
You must wear a seat belt if one is fitted in the seat you are using, and GOV.UK says you can be fined up to £500 if you do not when you are supposed to.4 Devon and Cornwall Police say a caught driver can expect "either a driver education course or a fine and penalty points", and that the government is consulting on introducing penalty points for seatbelt offences.2 This post describes the process; the offence rules and any penalty for a particular case are set by law and the force involved, so check the authoritative GOV.UK and police guidance.
Sources
- O*NET OnLine (U.S. Department of Labor), Summary Report for 33-3051.00, Police and Sheriff's Patrol Officers (O*NET 31.0 tasks), retrieved 2026-10-19.
- Devon & Cornwall Police, New AI camera for Plymouth collision hotspot, news article (2026), retrieved 2026-10-19.
- Kurrant (smart cities trade outlet), Suffolk Police Deploys AI Cameras To Detect Mobile Phone And Seatbelt Offences, July 28, 2026 (secondary source reporting Suffolk Constabulary).
- GOV.UK, Seat belts: the law, retrieved 2026-10-19.
- Acusensus (vendor), Heads-Up, retrieved 2026-10-19; vendor statements are claims.
- Acusensus (vendor), Data Security & Privacy, retrieved 2026-10-19; vendor statements are claims.
- Acusensus (vendor), United Kingdom, retrieved 2026-10-19; vendor statements are claims.