Some worry that eagerness could set the technology back. “A serious concern is that Tesla brashly and prematurely introduces technologies that are not ready for deployment yet, encounters crashes and fatalities, and triggers significant pushback from society at large and perhaps much stricter regulation,” says Carnegie Mellon’s Professor Raj Rajkumar.  Yet Rajkumar points to Google, which, after nine years of work on this project, still won’t even give a timeline for its rollout. “Mastery of self-driving under real-world conditions is not going to be easy,” he says.