A study by the American Automobile Association Foundation for Traffic Safety found that vehicle-related road debris — shredded tires, sofas and bedding, lost cargo, muffler parts and other hazards — accounted for 112 fatalities in 31 states from 1999 through 2001. That's roughly 1 out of 500 traffic deaths.
"It's a pretty low percentage overall, but it tends to be things that are preventable," said consultant Gerry Forbes, author of the study. "A little bit of education and enforcement could go a long way" toward preventing such accidents, he said.
The study showed road debris as a bigger problem in Texas, where it killed 33 people in that time, accounting for 1 in 300 traffic deaths.
More recent federal data, spanning the 10 years from 1995 through 2004, show 823 people died across the nation in crashes with objects in the road other than vehicles. Forbes cautioned that different agencies classify accidents differently. Some include flying vehicle parts from a crash as road debris, and others don't, for instance.
One estimate, based on a sample of accidents in which at least one vehicle was towed from the scene, says as many as 1 out of 200 such accidents were caused by road debris. Of those, nearly 40 percent involved injuries but fewer than 1 percent were fatal.
In 1 out of 4 of the accidents, the driver managed to avoid the object in the road but crashed anyway — as did the bus in last week's fatal wreck.