This handout photo provided by the Oklahoma Highway Patrol and the National Transportation Safety Board (NTSB), taken June 26, 2009, shows a tractor-trailer that crashed into cars on Interstate 44 near Miami. Oklahoma. (AP Photo/Oklahoma Highway Patrol, NTSB)

This handout photo provided by the Oklahoma Highway Patrol and the National Transportation Safety Board (NTSB), taken June 26, 2009, shows a tractor-trailer that crashed into cars on Interstate 44 near Miami. Oklahoma. (AP Photo/Oklahoma Highway Patrol, NTSB)