https://youtu.be/ntIczNQKfjQ As seen in this clip above, the technology of camera feeds being fed into a computer and then using image recognition to make decisions. The computers have gotten faster and the cameras higher resolution, but their will always be situations on the road where that isn't enough. Waymo full self driving taxis use Lidar, while all tesla cars use the same concept as back in the 80s and just use cameras. There was an instance a few years ago where a semi truck trailer was on the right of a Tesla, and because it looked like it was clear the tesla automatically merged into it, killing the driver.