Insurance and liability
So, assuming that Hammond's fantasy becomes reality and we have level 5 automated cars on the roads in 2020ish.......
L5 car driving solo gets involved in an RTC, either causes one, subject to, what ever, with a human controlled vehicle (car, bike, cycle, pedestrian). Who do you swap details with? Do you just get the reg number and report it? I can imagine an insurer receiving a claim, checking the car's data (assuming that the owner hasn't altered it to show that the car couldn't possibly be at fault) and deciding not to pay out because of some tiny detail on the data.
Give a whole new meaning to 'computer says no'