If too far off topic, please delete. Just read an article about the self driving Lexus that killed a pedestrian in AZ a few months ago. It seems the car experienced many false braking events so they disabled that function. The car "saw" the woman pushing the bike 6 seconds ahead of time, but did not alert the (distracted) driver. Feds: Braking system disabled in Uber self-driving SUV that fatally struck Arizona woman In the article they mention falsing on bridge overpasses and the like. Seems all cars have this problem. How do you sort out the stopped firetrucks on the road from the windblown walmart baggie? We've got a long way to go. There is more to driving than keeping it between the ditches. One more note... accidents just don't happen. An accident (or crash depending on your perspective) is when several unlikely things come together at the same time and place. In this AZ crash, a homeless drug addict pushing a bicycle with no reflectors across a street where she wasn't supposed to be was hit by an autonomous car whose safety braking had been disabled and depended on a distracted human to intervene. If any one component of this set of circumstances had been different, this accident would not have happened.