Peter Stellpflug loved his Farmall 300.
The vintage tractor didn't go very fast, but Stellpflug liked to use it to putter around his hobby farm in Eyota, Minn. He grew up on a farm outside Rochester using the same type of machine.
Built in the 1950s, the Farmall is known as a "tricycle" tractor because it features two small, close-set wheels made to fit between rows of planted crops. Such tractors are considered dangerously unstable. Typically they lack cabs to protect the farmer if they tip over. But the old machines remain popular.
In October 2011, Stellpflug's tractor rolled while he was mowing grass on a steep hill. He died from his injuries.
"I hated that tractor," said his widow, Tammy Stellpflug. "This is an accident that never should have happened."
Tractor rollovers have been the top cause of death on the family farm for decades, even though engineers long ago figured out how to build a safer machine. Roll bars and enclosed cabs that modern tractors come with greatly reduce the danger.
Other countries insist on such rollover protective structures, as they are known. But the United States allows hundreds of thousands of older tractors to remain in use without the safeguards. It also allows farmers to remove the safety features, and some do.
"We know Europe virtually eliminated rollover deaths because of their insistence on rollover protection," said Matt Keifer, director of the National Farm Medicine Center in Wisconsin. "I don't know why it is taking so long for us to figure this out."