Earlier quoted context omitted.
As far as that goes if we want to save lives we can just regulate that semi-autonomous cars have to enforce the speed limit + 0 visibility from fog and heavy rain is an automatic pull over and wait for conditions to improve.
I don't think cars enforcing the law is a good idea at all. You have the moral and legally defensible right to break the law where not doing so would create substantial and immediate risk to yourself of others.
Maybe Elon can add a prompt in the car: one time payment to unlock 100+ mph