And which have eyelids and tears and a human attached with hands ready to wipe if any dust or dirt gets into them. Then again, a human, even if fully focused o

And which have eyelids and tears and a human attached with hands ready to wipe if any dust or dirt gets into them. Then again, a human, even if fully focused on driving, can look only in one direction at a time. And, of course, most drivers aren’t fully focused on driving.