INJURED WAS HAULING SLATE FROM THE PREP PLANT TO AN AREA TO BED DOWN A ROAD. INJURED ASSUMED IT WOULD BE EASIER TO BACK OUT THE ROAD INSTEAD OF HEADING OUT AS THE OTHERS. AS HE BEGAN TO BACK O UT OF THE ROAD, HE NOTICED HE WAS TOO CLOSE TO THE DITCH. HIS REAR TIRES SLID ABOUT 4 FT INTO THE DITCH OVERTURNING TRUCK. HE WAS EXAMINED AT THE HOSPITAL AND RELEASED.