Well, Waymo's car drove a legally blind man as the only passenger: https://www.washingtonpost.com/local/trafficandcommuting/blind-man-sets-out-alone-in-googles-

Well, Waymo's car drove a legally blind man as the only passenger: https://www.washingtonpost.com/local/trafficandcommuting/blind-man-sets-out-alone-in-googles-driverless-car/2016/12/13/f523ef42-c13d-11e6-8422-eac61c0ef74d_story.html https://www.washingtonpost.com/local/trafficandcommuting/bli... So it seems like they're pretty close to L4.