I feel like high-speed+long distance+variable conditions will be the last and toughest nut to crack for AVs...especially if it is a shared environment with meatbags behind the wheel.
I may be wrong, but I think the acceptable for a computer to manage risk on an icy highway may be quite slow.
That said, I wouldn't necessarily mind adding say 25-50% to my travel time for mid-range trips if you end up in your destination with the benefits of having your vehicle and cargo (and a little more freedom/control of your trip).
It definitely makes long-term infrastructure planning tough. If I had to guess, I'd say we may be looking at dedicated lanes for AV's on busy high-speed roads, at least for a few decades of transition.
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