I wish people were not so into the whole self-driving car craze. I sincerely believe the self-driving features will never be able to live up to the public's expectations. It will be a massive headache for car companies who try, putting endless hours into sensors and software while being berated by their customers for it not being better.
People seem to think driving for a computer would be easy, in part because it is easy for a human. But I believe it's actually one of the more difficult things you could try to make a computer do. The highway system is designed for humans with brains, intuition, judgement, compassion, and the ability to deal with unexpected situations (example: sure, run over a small animal if it's safer but don't run over a toddler). Trying to make a computer do that is a herculean undertaking that I'm not convinced can be done. I think a lot of people are not giving enough credit to the incredible abilities of the human brain and sensory system. And I'm not a naysayer. I think we can definitely put a human colony on Mars. We can power the world with renewables. We will crack fusion power. Auto-pilot driver assist features? Sure. But self-driving cars on existing roads? I have serious doubts it can be done in a short time frame. Maybe in a few hundred years of software and sensor evolution and refinement. Maybe sooner if we modify the roads to be friendlier to automated systems.
Also, as cold as it sounds at first, saving lives is not the only variable in play. You could save lives by making the interstate speed limits 35 MPH. You could save lives by banning skydiving, rock climbing, skiing, football, and any other potentially hazardous recreational activity. You could save lives by sending all of the surplus wealth of first world countries to support third world countries (okay, that one seems a little harsh -- maybe consider sending ALL of your own extra wealth to organizations who work to improve the health of others). Who's in favor? Besides, risking your life is a part of living. It's just a matter of how the risks are balanced. A certain amount of risk is accepted and often even desired.