Today at Tesla’s first Autonomy Day event, Elon Musk took questions from the press but didn’t have time for questions about lidar. Historically, he’s been vocal about the technology, and this time he put it as clear as he could. “Lidar is a fool’s errand,” Elon Musk said. //

Andrej Karparthy, Senior Director of AI, took the stage and explained that the world is built for visual recognition. Lidar systems, he said, have a hard time deciphering between a plastic bag and a rubber tire. Large scale neural network training and visual recognition are necessary for Level 4 and Level 5 autonomy, he said.

“In that sense, lidar is really a shortcut,” Karparthy said. “It sidesteps the fundamental problems, the important problem of visual recognition, that is necessary for autonomy. It gives a false sense of progress, and is ultimately a crutch. It does give, like, really fast demos!”