Self driving has potential on finding the lanes (in rain, snow, mis paint) with infrared. The key component to driving in rain or snow is to slow down and increase following distance, something humans, but especially outliers, are relatively poor at.

Slowing down is also the best option for a tire tread or a shopping bag. The bag being less safe than you imply if it is filled with a box of nails or happens to wrap around a driveshaft or exhaust manifold.