Last fall, Missy Cummings sent a document to her colleagues at the National Highway Traffic Safety Administration that revealed a surprising trend: When people using advanced driver-assistance systems die or are injured in a car crash, they are more likely to have been speeding than people driving cars on their own.The two-page analysis of nearly 400 crashes involving systems like Tesla’s Autopilot and General Motors’ Super Cruise is far from conclusive. But it raises fresh questions about the technologies that have been installed in hundreds of thousands of cars on U.S. roads. Dr. Cummings said the data indicated that drivers were becoming too confident in the systems’ abilities and that automakers and regul …
