Certainly a higher error tolerance and lower risk of fatality as compared to a 5000 lb Tesla that goes to 0-60 in 2.4 seconds and takes a football field and a half to slow down.
Maybe they should just make all self-driving cars weigh 1500 lbs and top out at 45 mph. Not a big deal when they run into each other, like bumper cars.
I think collisions below 40 mph are quite survivable if they're not two-way head on/overlap and the cars are below a certain weight and designed to bounce against each other.
They just need to make every autonomous car on the road 1500-2000lb and install rubber bumpers. The neural net will figure it out itself after a few million real world collisions and daily commutes will gradually become less jarring and eventful.