{"id":"AIBD-0953","title":"Karolinska Institutet researchers find that fewer people were hit by trains in suicidal acts at 14 Stockholm metro stations with AI-CCTV","summary":"Researchers found that people hit by trains in suicidal acts fell from 1.17 to 0.50 a quarter at 14 Stockholm metro stations after SL installed AI-CCTV. Other stations saw no fall.","date_observed":"2021-10-01","date_basis":"event","date_precision":"month","benefit_status":"reported","source_collection":null,"source_entry":null,"account":"Storstockholms Lokaltrafik (SL), Stockholm's regional public transport authority, installed AI-CCTV at 14 of its 100 metro stations in October 2021. The software, IRIS-SL by Irisity, scans the feeds of existing platform cameras. It raises an alarm when a person enters the track area or stands at the platform edge. A safety officer reviews each alarm, and controllers can warn drivers, cut the power or call emergency services. Researchers at Karolinska Institutet compared these stations with the other 86 in a controlled interrupted time series. In the following year, people hit by trains in suicidal acts fell from 1.17 to 0.50 a quarter at the 14 stations. At the other stations the rate rose from 2.30 to 3.00. The primary controlled analysis gave a rate ratio of 0.32. No suicides occurred at the 14 stations that year, against six at the others, too few for statistical significance. Canceled train-kilometers also fell. By mid-2025, SL had logged 36 alarms that led to a person being safeguarded. The Swedish Transport Administration funded the study. Three of its authors also work for Stockholm Health Care Services, a part of Region Stockholm, which also runs SL. The authors call the findings preliminary because the follow-up lasted four quarters and events were few.","category":"aggregate result","unexpected":false,"purpose":"Irisity built IRIS-SL to scan station camera feeds and alert SL's safety officers when a person enters the track area or stands at the platform edge.","system":"AI-CCTV (IRIS-SL video analytics by Irisity) on existing platform cameras","model_version":null,"developer":"Irisity AB","deployer":"Storstockholms Lokaltrafik (SL), the regional public transport authority","location":"Stockholm, Sweden (14 metro stations)","domain":"Public transport safety / suicide prevention","segment":null,"benefit_type":"Improved Physical Health","work_activities":["4.A.1.a.2","4.A.1.b.1"],"taxonomy_note":null,"registry_ids":{},"ratings":[{"group":"societal","depth":4,"reason":"In the first year, people hit by trains in suicidal acts at the 14 stations fell from 1.17 to 0.50 a quarter, a population-level fall in serious harm."},{"group":"organizational","depth":2,"reason":"The researchers found that canceled train-kilometers in the metro fell after installation, a measured gain for SL's service."},{"group":"personal","depth":null,"reason":"SL logged 36 alarms that led to a person being safeguarded, and the study cannot say which of them would have ended in harm."}],"ai_role":{"status":"assessed","statement":"The researchers compared the 14 stations with AI-CCTV with the 86 without it, before and after installation. The measured change belongs to the alarms together with the human response, since a safety officer reviewed every alarm. The study's appendix names the software as IRIS-SL by Irisity and describes a trained model that detects and tracks people. The Swedish Transport Administration funded the study, and SL supplied data."},"evidence":[{"kind":"peer-reviewed study","citation":"Fredin-Knutzén J, Hadlaczky G, Andersson A-L, Sokolowski M. Reduction in suicides and suicide attempts following implementation of AI-based video surveillance in the Stockholm metro system: an intervention study. BMC Public Health. 2026;26:1997. doi:10.1186/s12889-026-28358-1. Published 1 July 2026. Abstract, Results and Discussion. Additional file 1, section AI-CCTV, names the software.","title":"Reduction in suicides and suicide attempts following implementation of AI-based video surveillance in the Stockholm metro system: an intervention study","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13321902/","date":"2026-07-01","written_by":"independent","quote":"Implementation of AI-CCTV as described herein was associated with lower rates of PUT due to suicidality at metro stations, as well as changes in the same direction for e.g. deaths by suicide and less cancelled train-kilometers"},{"kind":"press release","citation":"Irisity AB. Irisity vinner SLs omfattande upphandling av videoanalys för tunnelbana (Irisity wins SL's large procurement of video analytics for the metro). Press release via Cision, 27 November 2020.","title":"Irisity vinner SLs omfattande upphandling av videoanalys för tunnelbana","url":"https://news.cision.com/se/irisity-ab/r/irisity-vinner-sls-omfattande-upphandling-av-videoanalys-for-tunnelbana,c3245419","date":"2020-11-27","written_by":"makers","quote":"Irisity AB (publ) har valts av AB Storstockholms Lokaltrafik att leverera deep learning algoritmen IRIS Rail till Stockholms tunnelbana."}],"replication":{"produced_by":["The software scanned the feeds of existing platform cameras and raised an alarm when a person entered the track area or stood at the platform edge.","A safety officer reviewed each alarm and passed elevated risks to a train traffic controller.","The controller warned the train driver, cut the power and called emergency services."],"must_hold":["Staff can slow or stop a train before it reaches the person.","Cameras cover the platform near the track at enough resolution to detect a person."],"echoes":[]},"paired_incident":null,"headline":"Fewer suicidal acts on the tracks at Stockholm stations with *AI-CCTV*","metric":"from 1.17 to 0.50 a quarter","comparator":{"against":"The same 14 stations before October 2021, with the other 86 metro stations as controls","before":"1.17 per quarter in the intervention group (55 in total)","after":"0.50 in the intervention group (2 in total)","basis":"measured","quote":"Before the AI-CCTV implementation, the average number of PUT due to suicidality was 1.17 per quarter in the intervention group (55 in total) and 2.30 per quarter in the control group (108 in total). After the introduction of AI-CCTV, these numbers changed to 0.50 in the intervention group (2 in total) and 3.00 in the control group (12 in total), as displayed in Fig. 2.","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13321902/"},"later":{"status":"unknown","date":"2025-06-30","note":"Over a longer period to mid-2025, which included media coverage and other measures, the researchers found that the controlled estimate was no longer statistically significant. 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