An automated driving system also has a lot more potential sensory inputs than eyes and ears. 360-by-360-degree cameras, radar, IR, etc, which might be able to see through rain, snow, hail, etc. just fine.

Unmarked roads, bad traffic patterns, and routing problems are things we already rely on maps/GPS data for anyway. This system can look at these and get real-time updates without taking its 'eyes' off the road.