Well, if I must fall asleep while driving, I'd rather do it in a horse-drawn buggy than an automobile. The horse will probably not allow the buggy to run off the road and smash into a tree. In fact, the horse probably knows the way home and can get there with no human help at all unless there are man-made isues like traffic signals to deal with. I doubt there are many horses smart enough to know the right-of-way rules at a four-way stop.