📖 The Quick Answer
A forward camera classifies shapes as pedestrians, cyclists, or vehicles. A radar tracks distance and closing speed. When the system predicts an imminent pedestrian strike, it warns the driver and, if no response, applies the brakes automatically.
⚙ How It Works (Sensors and Algorithm)
The forward camera runs a neural-network classifier on every frame to label objects in the scene. Radar measures range and rate. The ADAS computer fuses both inputs and computes time-to-collision specifically for pedestrian targets, which move differently than vehicles. Modern systems detect adults, children, and partially obscured pedestrians, and some include cyclist detection as a separate class.
🛡 What It Protects Against
Pedestrian crashes, which account for about 17 percent of US traffic fatalities and have been rising. IIHS testing shows the best pedestrian AEB systems prevent crashes at 12 mph and reduce severity at 25 mph.
⚠ Limitations and When It Fails
Nighttime performance has historically been weak. NHTSA found many systems fail at night even when they pass in daylight, which is why the 2029 rule mandates nighttime detection. Other limits: people in dark clothing, children stepping out from behind parked cars, and bicycles at high closing speeds. Pedestrian detection also will not catch every edge case (animals, wheelchairs, scooters).
🚗 Which Vehicles Have It
Bundled with AEB on virtually every new US vehicle since 2020, mandatory by 2029 including nighttime performance. Branded under the same names as AEB (Honda Sensing, Toyota Safety Sense, Subaru EyeSight, Ford Co-Pilot360 with Pedestrian Detection, Volvo City Safety with Pedestrian Detection).
🔧 Related TSBs and Recalls
Volvo and Subaru have led IIHS pedestrian-AEB tests. Several Tesla NHTSA investigations include pedestrian-AEB performance. Owners should keep ADAS software up to date.