When operating around a ditch, look ahead for holes, gullies, and wash-outs. Stay away from ditches and river banks where possible. If you can't, look and think ahead. Reduce speed when turning, crossing slopes, and on rough, slick, or muddy surfaces. Slow down before making any turn.
Centrifugal force is one of the major causes in tractor upsets.
The centrifugal force tries to keep the tractor going in a straight line. As you double the speed of a tractor while turning, the danger of upsetting is increased four times. Reduce speed when turning with a loader. As you turn with a raised loader, you increase the possibilities of a tractor overturn. Keep the bucket as low as possible, and watch for ditches, holes, and rocks that might cause an upset.