Full self driving is one of those things where getting 80% of the way there will take 20% of the effort and getting the remaining 20% of the way there will take

Full self driving is one of those things where getting 80% of the way there will take 20% of the effort and getting the remaining 20% of the way there will take 80% of the effort. Tesla auto-drive seems like it's about 80% of the way there.