I used to work at a full service ag company. Our operator must have had a sleeping problem at night because he could fall asleep anytime, anywhere. One day we were applying ag lime with a terra-gator, big three wheeled machine. We were on a pretty flat field so it was easy to see where he had been and where he was going. Anyway he was going on his line and all the sudden starts drifting, and drifting, and before you know it he's cutting strait across the field before the machine jerks back. Whoops, hehe, wake up!