In 2017, the feds said Tesla Autopilot cut crashes 40%—that was bogus

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The National Highway Traffic Safety Administration has egg on its face after a small research and consulting firm called Quality Control Systems produced a devastating critique of a 2017 agency report finding that Tesla's Autopilot reduced crashes by 40 percent. The new analysis is coming out now—almost two years after the original report—because QCS had to sue NHTSA under the Freedom of Information Act to obtain the data underlying the agency's findings. In its report, QCS highlights flaws in NHTSA's methodology that are serious enough to completely discredit the 40 percent figure, which Tesla has cited multiple times over the last two years.
NHTSA undertook its study of Autopilot safety in the wake of the fatal crash of Tesla owner Josh Brown in 2016. Autopilot—more specifically Tesla's lane-keeping function called Autosteer—was active at the time of the crash, and Brown ignored multiple warnings to put his hands back on the wheel. Critics questioned whether Autopilot actually made Tesla owners less safe by encouraging them to pay less attention to the road.
NHTSA's 2017 finding that Autosteer reduced crash rates by 40 percent seemed to put that concern to rest. When another Tesla customer, Walter Huang, died in an Autosteer-related crash last March, Tesla cited NHTSA's 40 percent figure in a blog post defending the technology. A few weeks later, Tesla CEO Elon Musk berated reporters for focusing on stories about crashes instead of touting the safety benefits of Autopilot.
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