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Among 4,131 pedestrians, AEB was associated with 20% lower odds of a fatal or serious injury (adjusted odds ratio 0.80, 95% CI 0.64 to 0.996). Among 6,659 cyclists, the authors found no significant association (adjusted odds ratio 0.91). Accident Analysis & Prevention published the study online on 10 May 2025. The study is cross-sectional and covers only crashes that happened, so it measures injury severity and cannot count crashes that AEB avoided. The upper bound of the pedestrian estimate is close to no effect, and the authors call for studies of newer systems that detect cyclists.","category":"general benefit","unexpected":false,"purpose":"AEB is built to brake automatically to avoid or soften a collision. The milder pedestrian injuries that the study measured were within that purpose.","system":"Automatic emergency braking (AEB) offered as an option on six best-selling passenger car models in Japan","model_version":null,"developer":"Makers of the six car models (not named in the abstract)","deployer":"Makers of the six car models (factory-fitted optional equipment; makers not named in the abstract)","location":"Japan","domain":"Road safety","segment":null,"benefit_type":"Reduced Risk","taxonomy_note":null,"registry_ids":{},"ratings":[{"group":"societal","depth":4,"reason":"Across national police data, struck pedestrians had 20% lower odds of fatal or serious injury when the car had AEB."}],"ai_role":{"status":"assessed","statement":"The study compares crashes involving the same six models with and without AEB, with adjustment for confounders; the comparison is observational."},"evidence":[{"kind":"peer-reviewed study","citation":"Inada H, Ichikawa M. Association between automatic emergency braking and pedestrian and cyclist injury severity in Japan. 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