EV's I know there are folks better versed than me in here

How will a self driving system handle that perfect snow covered road? No tracks, no lines, no plowed ridges? Can it feel the gravel on the right and steer just a hair left? Or keep it just one tire on the gravel berm? Real dense fog? A leaf covered road? The infamous lane and a half roads where I grew up?

Aircraft, in a much tighter controlled environment, still need a pilot, or two.