{ "id": "AIBD-0008", "title": "Front crash prevention (FCW/AEB) associated with 27–50% lower rear-end striking crash rates in US police-reported data", "summary": "IIHS: FCW alone, low-speed AEB and FCW+AEB cut rear-end striking crash rates 27%, 43%, 50% in 22 US states, 2010–2014 (cohort)", "date_observed": "2017-02-01", "date_basis": "unassessed", "date_precision": "unassessed", "benefit_status": null, "source_collection": null, "source_entry": null, "account": "Jessica Cicchino (Insurance Institute for Highway Safety) published in Accident Analysis and Prevention volume 99 (February 2017). Her measure was police-reported crash involvements per insured vehicle year in 22 US states during 2010–2014. She compared passenger vehicle models with optional forward collision warning (FCW) alone or FCW with autonomous emergency braking (AEB) to the same models without it. She also compared Volvo 2011–2012 S60 and 2010–2012 XC60 vehicles with standard low-speed AEB to other luxury midsize cars and SUVs without it. FCW alone, low-speed AEB and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43% and 50%. Injury crash rates fell 20%, 45% and 56%. FCW with AEB increased rear-end struck involvements by 20%. No individual avoided crash is documented.", "category": "general benefit", "unexpected": false, "purpose": "Built to warn drivers and brake automatically when a frontal collision is imminent. The measured reduction in rear-end striking crashes is that purpose.", "system": "Front crash prevention systems (FCW, low-speed AEB, FCW with AEB) on passenger vehicles from multiple automakers, including Volvo's standard low-speed AEB on 2011–2012 S60 and 2010–2012 XC60", "model_version": null, "developer": null, "deployer": null, "location": null, "domain": "Road vehicle crash avoidance", "segment": "Automotive", "benefit_type": "Increased Product Safety", "taxonomy_note": null, "registry_ids": {}, "ratings": [ { "group": "societal", "depth": null, "reason": "The study reports cohort-level rate reductions, not an individually attributable outcome." }, { "group": "personal", "depth": null, "reason": "The study reports cohort-level rate reductions without individually attributable outcomes." } ], "ai_role": { "status": "assessed", "statement": "Front crash prevention systems are automated perception-and-braking systems. The within-model comparisons (FCW alone, FCW with AEB) and Volvo S60/XC60 comparison with other luxury midsize cars and SUVs (low-speed AEB) control for other factors. They show effectiveness as a rate, not any single avoided crash. Whether such systems count as AI is a definitional choice the sources do not settle." }, "evidence": [ { "kind": "peer-reviewed study", "citation": "Cicchino, J.B. (2017). Effectiveness of forward collision warning and autonomous emergency braking systems in reducing front-to-rear crash rates. Accident Analysis and Prevention 99:142–152. doi:10.1016/j.aap.2016.11.009.", "title": "Effectiveness of forward collision warning and autonomous emergency braking systems in reducing front-to-rear crash rates", "url": "https://www.reginfo.gov/public/do/eoDownloadDocument?pubId=&eodoc=true&documentID=219043", "date": "2017-02-01", "written_by": "independent", "quote": "FCW alone, low-speed AEB, and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43%, and 50%, respectively." }, { "kind": "regulatory document", "citation": "National Highway Traffic Safety Administration. Federal Motor Vehicle Safety Standards; Automatic Emergency Braking Systems for Light Vehicles. Final rule, 89 FR 39686, 9 May 2024 (FR Doc. 2024-09054).", "title": "Federal Motor Vehicle Safety Standards; Automatic Emergency Braking Systems for Light Vehicles", "url": "https://www.federalregister.gov/documents/2024/05/09/2024-09054/federal-motor-vehicle-safety-standards-automatic-emergency-braking-systems-for-light-vehicles", "date": "2024-05-09", "written_by": "independent", "quote": null, "supports_benefit": false } ], "replication": { "produced_by": [ "Vehicle fitted with FCW and/or AEB", "Rear-end conflict within the system's operating speed range" ], "must_hold": [ "FCW and FCW+AEB comparisons use the same vehicle models with and without the optional system, controlling for other crash-risk factors. The low-speed AEB comparison uses Volvo S60/XC60 models against other luxury midsize cars and SUVs without the system", "Results are rates per insured vehicle year, not individual events" ], "echoes": [] }, "paired_incident": { "database": "AI Incident Database", "identifier": "341", "title": "Nissan's \"Automatic Emergency Braking\" False Positives Posed Traffic Risks to Drivers", "url": "https://incidentdatabase.ai/cite/341", "severity": null, "group": "societal", "basis": "Automatic emergency braking on passenger cars: Nissan's AEB false positives caused abrupt braking that endangered its drivers and other traffic participants, the road users whose rear-end crash rates FCW and AEB reduced in the IIHS data." }, "headline": "FCW and AEB cut rear-end striking crash rates 27–50%", "metric": "reduced rear-end striking crash involvement rates by 27%, 43% and 50%", "comparator": { "against": "the same vehicle models where the optional systems were not purchased (and comparable luxury vehicles without standard low-speed AEB)", "before": "the same models where the optional systems were not purchased", "after": "reduced rear-end striking crash involvement rates by 27%, 43%, and 50%, respectively", "basis": "measured", "quote": "FCW alone, low-speed AEB, and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43%, and 50%, respectively. Rates of rear-end striking crash involvements with injuries were reduced by 20%, 45%, and 56%, respectively, by FCW alone, low-speed AEB, and FCW with AEB, and rates of rear-end striking crash involvements with third-party injuries were reduced by 18%, 44%, and 59%, respectively.", "url": "https://www.iihs.org/research-areas/bibliography/ref/2111" }, "later": { "status": "scaled", "date": "2024-05-09", "note": "NHTSA adopted FMVSS No. 127 on 9 May 2024, requiring automatic emergency braking, including pedestrian AEB, on all new light vehicles.", "quote": "This final rule adopts a new Federal Motor Vehicle Safety Standard to require automatic emergency braking (AEB), including pedestrian AEB (PAEB), systems on light vehicles.", "url": "https://www.federalregister.gov/documents/2024/05/09/2024-09054/federal-motor-vehicle-safety-standards-automatic-emergency-braking-systems-for-light-vehicles" }, "value": null, "developer_country": null, "deployer_country": null, "unrated_because": null, "brief_notes": null, "brief": null, "revisions": [ { "date": "2026-10-20", "change": "Record drafted from the cited sources.", "source": null, "editor": "AIBD" }, { "date": "2026-10-20", "change": "Paired with AI Incident Database incident 341 (high confidence); severity not given by the source.", "source": "https://incidentdatabase.ai/cite/341", "editor": "AIBD" }, { "date": "2026-10-20", "change": "Account, what must hold again and AI-role statement corrected because only the FCW-alone and FCW-with-AEB analyzes compared the same models with and without the option; the low-speed AEB analysis compared Volvo 2011–2012 S60 and 2010–2012 XC60 vehicles with other luxury midsize cars and SUVs without the system.", "source": "https://www.reginfo.gov/public/do/eoDownloadDocument?pubId=&eodoc=true&documentID=219043", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Headline reworded to state the event without naming who claims it.", "source": null, "editor": "AIBD" }, { "date": "2026-10-21", "change": "Benefit type set to Increased Product Safety under Trustible's full taxonomy of 23 types; it was Improved Organizational Efficiency among the six first used.", "source": "https://trustible.ai/post/a-framework-for-measuring-the-benefits-of-ai/", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Added what the benefit is measured against, what happened since from the cited sources.", "source": "https://www.iihs.org/research-areas/bibliography/ref/2111; https://www.federalregister.gov/documents/2024/05/09/2024-09054/federal-motor-vehicle-safety-standards-automatic-emergency-braking-systems-for-light-vehicles", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Prose pass: a rating reason, account, purpose, the replication conditions, the system's part rewritten in shorter sentences with abbreviations expanded; facts, figures and quotations unchanged.", "source": null, "editor": "AIBD" }, { "date": "2026-10-25", "change": "Reviewed the specified original sources; corrected their authorship, document types, and support for the reported benefit.", "source": "https://www.reginfo.gov/public/do/eoDownloadDocument?pubId=&eodoc=true&documentID=219043", "editor": "AIBD" } ], "confidence": "studied", "shade": "high", "claim_status": "Independently studied", "claim_basis": "Sources: one independent regulatory document and one independent peer-reviewed study. For the benefit itself, the cited sources include no finding by a regulator or court.", "profile": { "case_id": "AIBD-0008", "catalog_version": "1.0.0", "source_fingerprint": "df8e8ec80818121bddb21f4f91dbf3feb4d9fd7909650d273aa9c41a6b3ef04e", "collection_refs": [ { "collection_id": "aibd", "version": "snapshot-8bf7cfec9cb185aa" }, { "collection_id": "aibd", "version": "2026-10-25" }, { "collection_id": "querist", "version": "2026-10-25" } ], "source_ids": [ "AIBD-0008-source-0001", "AIBD-0008-source-0002" ], "families": { "strategic assessments": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "evaluations": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "monetary observations": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "institutional decisions": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] } }, "fields": { "actors[]": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "actors[].ownership_control": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "ai_contribution": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "ai_role": { "status": "assessed", "statement": "Front crash prevention systems are automated perception-and-braking systems. 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Her measure was police-reported crash involvements per insured vehicle year in 22 US states during 2010–2014. She compared passenger vehicle models with optional forward collision warning (FCW) alone or FCW with autonomous emergency braking (AEB) to the same models without it. She also compared Volvo 2011–2012 S60 and 2010–2012 XC60 vehicles with standard low-speed AEB to other luxury midsize cars and SUVs without it. FCW alone, low-speed AEB and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43% and 50%. Injury crash rates fell 20%, 45% and 56%. FCW with AEB increased rear-end struck involvements by 20%. 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Its findings, including the increase in rear-end struck crashes, remain in that paper.", "retained_source_ref": "AIBD-0008-source-0001" } ], "review_scope": "Whether the specified sources establish the reported benefit, their document types, and their authorship relationships. Other fields and sources were not comprehensively reassessed." } }, "provenance": { "kind": "source_review", "basis": "A limited source-role review; each inspected source and its contribution is identified.", "record_fields": [], "source_refs": [ "AIBD-0008-source-0001", "AIBD-0008-source-0002" ], "reviewed_on": "2026-10-25" }, "review_state": "reviewed", "coverage": "partial", "display": { "answer": "The IIHS paper reports the crash-rate estimates. Its bibliography page is another version of the same work. 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FCW alone, low-speed AEB and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43% and 50%. Injury crash rates fell 20%, 45% and 56%. FCW with AEB increased rear-end struck involvements by 20%. No individual avoided crash is documented." } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "summary", "account" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "systems[].autonomy_permissions": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].component_role": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].deployment_configuration": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].inputs_outputs": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].model_name": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].model_version": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].product_name": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "system": "Front crash prevention systems (FCW, low-speed AEB, FCW with AEB) on passenger vehicles from multiple automakers, including Volvo's standard low-speed AEB on 2011–2012 S60 and 2010–2012 XC60" } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "system" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "systems[].provider": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "taxonomy_crosswalks[]": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "title": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "title": "Front crash prevention (FCW/AEB) associated with 27–50% lower rear-end striking crash rates in US police-reported data", "headline": "FCW and AEB cut rear-end striking crash rates 27–50%" } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "title", "headline" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "version": { "state": "value_present", "value": { "kind": "identifiers", "identifiers": [ "df8e8ec80818121bddb21f4f91dbf3feb4d9fd7909650d273aa9c41a6b3ef04e" ], "role": "SHA-256 of normalized original case data" }, "provenance": { "kind": "curatorial", "basis": "Deterministic content version assigned by the local migration.", "record_fields": [], "source_refs": [] }, "review_state": "record_mapped", "coverage": "complete" }, "workflow": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "account": "Jessica Cicchino (Insurance Institute for Highway Safety) published in Accident Analysis and Prevention volume 99 (February 2017). Her measure was police-reported crash involvements per insured vehicle year in 22 US states during 2010–2014. She compared passenger vehicle models with optional forward collision warning (FCW) alone or FCW with autonomous emergency braking (AEB) to the same models without it. She also compared Volvo 2011–2012 S60 and 2010–2012 XC60 vehicles with standard low-speed AEB to other luxury midsize cars and SUVs without it. FCW alone, low-speed AEB and FCW with AEB reduced rear-end striking crash involvement rates by 27%, 43% and 50%. Injury crash rates fell 20%, 45% and 56%. FCW with AEB increased rear-end struck involvements by 20%. No individual avoided crash is documented.", "replication": { "produced_by": [ "Vehicle fitted with FCW and/or AEB", "Rear-end conflict within the system's operating speed range" ], "must_hold": [ "FCW and FCW+AEB comparisons use the same vehicle models with and without the optional system, controlling for other crash-risk factors. The low-speed AEB comparison uses Volvo S60/XC60 models against other luxury midsize cars and SUVs without the system", "Results are rates per insured vehicle year, not individual events" ], "echoes": [] } } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "account", "replication" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" } }, "summary": { "total": 91, "addressed": 91, "known": 27, "reviewed": 2, "record_mapped": 25, "not_assessed": 64, "complete": false, "by_state": { "value_present": 27, "not_reported": 0, "unresolved": 0, "not_assessed": 64, "not_applicable": 0, "withheld": 0, "source_unavailable": 0 } } } }