LIDAR puts pretty severe limits on top speed. Basically, LIDAR has range limitations which means it can't detect anything further than <mumble mumble> away reli

LIDAR puts pretty severe limits on top speed. Basically, LIDAR has range limitations which means it can't detect anything further than <mumble mumble> away reliably (I last worked on a driving robot project a decade ago, forgot the exact distance). But the range, versus human-comfortable braking distance, works out to a top speed of roughly 30kph. Go faster and your car will detect the obstacle too late to avoid hitting it. Since Autopilot is trying to solve a problem at highway speeds (100kph+), I don't think it's a good fit for what Musk is trying to do. Now whether what Musk is trying to do is a good idea is a different question...