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She estimated crash rates per insured vehicle year and checked them with a second method that compares pedestrian crashes with a crash type that the system cannot affect. Vehicles with the system had a 25% to 27% lower pedestrian crash risk and a 29% to 30% lower pedestrian injury crash risk. Accident Analysis & Prevention published the study online on 14 May 2022. The study found no evidence of a benefit at night on roads without street lighting or at speed limits of 50 mph or more. It also found no evidence of a benefit when the equipped vehicle was turning. The design is observational, and the abstract does not name the makers or describe the detection software.","category":"general benefit","unexpected":false,"purpose":"Pedestrian detection systems are built to warn drivers of a likely collision with a pedestrian, and many brake automatically when a crash is imminent. 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