My niece once took me somewhere in her Golf. As she didn't know how to get there she took out her phone, thumbed up a GPS app, dialed in the destination then studied the route. All while driving and taking the occasional look outside. When I nervously asked her why she didn't get a proper GPS so she could hear directions and take a quick look down at the screen now and again she airily replied that she preferred to look at her phone because she was a visual person, not an auditory person! It all helped to reinforce my opinion that humans in a car are unpredictable loose cannons, and that the sooner self-driving cars become a lot better the sooner the road toll will show a precipitous decline.
On another note, a couple of years ago I took a demonstration ride in a Tesla. We were going along a multi-lane, slightly winding freeway and I was enjoying the sensation of the car keeping between the white lines, slowing down behind a slower car and then speeding up again when the road was clear. We came up to a truck in the lane to our left and, just as our front was about level with the truck's rear it started to move into our lane. I don't know whether the car would have done anything because I immediately turned the auto off and the car slowed down. Thinking about it later it occurred to me that as it was my first experience of auto driving I was alert and had my finger poised over the kill switch. I wonder how many Tesla crashes have been caused because the driver has been daydreaming, distracted or playing games on his phone?