Pretty much all electric cars have single speed transmissions, so there's no downshifting. And modern vehicles have electronic stability control, anti-lock brakes, automatic emergency braking, and several other safety systems. It's pretty hard to overreact with those enabled. The main issue is that people exceed safe speeds for the conditions, making them unable to brake or turn in time to avoid a collision.
Right now, most self-driving software will refuse to activate in conditions of poor visibility. I've had that happen with Tesla's FSD, though in that case it was snowing so much that the road should have been closed. Also when the snow is deep enough that your front bumper becomes a plow, it will refuse to activate.
Right now, most self-driving software will refuse to activate in conditions of poor visibility. I've had that happen with Tesla's FSD, though in that case it was snowing so much that the road should have been closed. Also when the snow is deep enough that your front bumper becomes a plow, it will refuse to activate.