Abstract: Employee #1 was operating a mid-size John Deere tractor with roll-over protection. He was applying sulfur dust to vineyards as contracted by his employer. The vineyards were located on a hillside that had been planted according to a terracing system. Employee #1 was turning the tractor so he could dust an adjacent row, when he apparently turned too soon and the tractor's front wheel dropped over a 9 to 12 in. terrace. The tractor rolled over, ejecting Employee #1. He suffered a broken pelvis and lacerations to his genital area. An interview revealed that Employee #1 was not wearing his seat belt even though the employer's safety rules require employees to wear one. Other employees stated that they feared wearing the seat belts, and would unhook them when their supervisors were not present.