Google's already got a fleet of automated cars that have been racking up tens of thousands of miles. Not an expert on the field but they're using a combination of radars and image processing, and it's likely that those tech combined give you a more accurate vision of what's in front of you than what a person would see, even in something like a snowstorm. Articles from a year ago point out manned drivers had to take over in oddball situations like a bike running a red light, but these are safety situations that you can program for and avoid (in the case of a biker avoiding debris you could recognize the hand signal through visual sensors, or the movement of cyclist heading into traffic lane, or both). And the more automated cars there are in the system, the less these safety stop situations will occur anyway, as they'll be in constant check with each other.

May seem like a pipe dream now, but costs of auto accidents are staggering enough that it'll happen, and probably sooner than you'd think.