When Will Cars Be Fully Self-Driving?

Around now, we should be relaxing in the driver’s seat of our autonomous cars, streaming a TV show or perhaps even taking a nap while the vehicles drive us safely to our destinations.

That was the prediction several years ago by some auto-industry executives and technology experts. But after billions of dollars in research-and-development spending, autonomous-vehicle technology hasn’t advanced anywhere near the point where it can replace human drivers…

The Wall Street Journal gathered three experts to discuss the future of autonomous vehicles: Alexandre M. Bayen, a professor of electrical engineering and computer science at the University of California, Berkeley; Raj Rajkumar, a professor in the electrical and computer engineering department at Carnegie Mellon University; and Juergen Reers, a senior managing director at consulting firm Accenture who is part of its mobility practice.