I live in South Texas where we get snow and ice about once every 2-3 years. My car was at the dealer for service so I had a brand new 2018 ES loaner when we got one of these “blue moon” snows a couple weeks ago. I met a buddy for dinner and the snow started coming down while I was inside the restaurant eating. As soon as I get in the car and begin driving I got an automatic message on the dash advising me to be cautious on the slick roads...I was very impressed it knew to tell me that...but how did it know? I hadn’t even reached the parking lot exit and the car knew more about road conditions than I did. Maybe it analyzed the ambient temperature and the moisture from the rain sensing wiper blade system, or maybe it used XM Sirius weather or the HD radio metadata source...who knows. Either way, I’m glad the car told provided me the warning. I have a feeling Lexus and other car manufacturers shut down the “autonomous” driving features because they all frankly know that none of these systems are ready for true critical situations just yet. They’re great features and make us feel good that our cars are somewhat “intelligent”. But watch any video review of a car’s autonomous/safety features in the last year and almost all of them will tell you they’re ok, but not great. These manufacturers know that the good ‘ole human brain is much better at making critical decisions, although cars may have the upper hand in a few years.