I also don't have a problem with the law currently not allowing autonomous commercial vehicles, as I read this to mean 18-Wheelers and if there are already a lot of accidents with the cars, I'd hate to see the same with the big trucks. Even if the majority of the accidents are from human error in other cars.

I'm not really sure I see your point. If we automate big trucks, then big trucks stop causing accidents. If a human driver is careless enough to rear end an 18-wheeler, there's not much we can do about that.