New Tesla autopilot Model S on Autopilot,

Where radar is good at detecting objects and relaying how far away they are, it cannot determine shapes accurately; lidar can, making it suitable for spotting cars, trucks, bikes, pedestrians and wildlife at the roadside and in a vehicle's path.
Speaking of the crash in May, which resulted in the death of Tesla Model S owner Joshua Brown, Lidow says that lidar would, without question, have prevented the collision. The crash occurred when neither Brown nor his car's Autopilot system could differentiate a white truck turning across the road in front, and the bright sky behind it.

Auto pilot of Tesla,

The typical lidar system for a self-driving car, which sits on the roof and spins around to capture an image of the vehicle's environment, has 64 lasers each emitting a pulse of light one billions times every second. "There is not much computation needed to work things out" Lidow said, regarding the images created by lidar. He also said claims lidar cannot see through rain and fog are untrue and the technology's vision through bad weather is "better than humans."

A Model S test car with lidar equipment on its roof has been spotted driving close to Tesla's California headquarters, and although the company has not commented on the car Lidow says he would be "profoundly surprised" if the technology was not added to future Teslas.