What's probably going to be really difficult is not getting automated cars on the market, but getting all the non-automated cars off the road. An entirely automated traffic flow would be much safer than a partly automated traffic flow, but there are going to be lots of holdouts who refuse to trust an automated car over their own driving ability, or who simply can't or won't buy an up-to-date car.
When automated cars are at 90% or so, and if you keep on getting statistics like how many accidents and deaths are caused by humans versus machines, I think the pressure to go all automated will be strong. Some municipalities and states will go for it, and then it'll be hard to get anywhere with a human-driven car.
I posted in Practical Ethics, arguing that if we mentally anthropomorphised certain risks, then we'd be more likely to give them the attention they deserved. Slaying the Cardiovascular Vampire, defeating the Parasitic Diseases Death Cult, and banishing the Demon of Infection... these stories give a mental picture of the actual good we're doing when combating these issues, and the bad we're doing by ignoring them. Imagine a politician proclaiming:
An amusing thing to contemplate - except, of course, if there were a real Cardiovascular Vampire, politicians and pundits would be falling over themselves with those kinds of announcements.
The field of AI is already over-saturated with anthropomorphisation, so we definitely shouldn't be imagining Clippy as some human-like entity that we can heroically combat, with all the rules of narrative applying. Still it can't hurt to dream up a hideous Bias Demon in its mishaped (though superficially plausible) lair, cackling in glee as someone foolishly attempts to implement an AI design without the proper safety precautions, smiling serenely as prominent futurist dismiss the risk... and dissolving, hit by the holy water of increased rationality and proper AI research. Those images might help us make the right emotional connection to what we're achieving here.