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In the early days of what ultimately became Waymo, Google’s self-driving car division (known at the time as “Project Chauffeur”), there were “more than a dozen accidents, at least three of which were serious,” according to a new article in The New Yorker.

The magazine profiled Anthony Levandowski, the former Google engineer who was at the center of the Waymo v. Uber trade secrets lawsuit. According to the article, back in 2011, Levandowski also modified the autonomous software to take the prototype Priuses on “otherwise forbidden routes.”

Citing an anonymous source, The New Yorker reports that Levandowski sat behind the wheel as the safety driver, along with Isaac Taylor, a Google executive. But while they were in the car, the Prius “accidentally boxed in another vehicle,” a Camry.