There were 11 incidents where Teslas using Autopilot crashed into stationary first-responder vehicles, causing injury to 17 people and one death. The US National Highway Traffic Safety Administration (NHTSA) investigation covers 765K vehicles, almost all Teslas sold in the US from 2014 - 2021. Most of the incidents took place after dark, with the software ignoring scene control measures including flashing lights, flares, an illuminated arrow board or cones warning of hazards.
Both Tesla and Volvo's driving assist manuals warn about this problem: "Traffic-Aware cannot detect all objects and may not brake/decelerate for stationary vehicles, especially in situations when you are driving over 50 mph (80 km/h) and a vehicle you are following moves out of your driving path and a stationary vehicle or object is in front of you instead."
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