I'd like to see some analysis of the predicted severity of the accidents for self driving cars. A minor fender bender at low speed vs. losing control and going

I'd like to see some analysis of the predicted severity of the accidents for self driving cars. A minor fender bender at low speed vs. losing control and going over a guard rail at 80 mph are both "accidents" - but have entirely different consequences. I have a hunch that while human drivers are still better, when they do have accidents some percentage of those tend to be much more fatal.