Feds: Fatal team bus crash was preventable

• Story Highlights
• NEW: Driver party at fault, investigators say, but not because of health problems
  
• Investigators: Driver thought he was entering HOV lane when he drove off overpass
  
• NTSB chairman calls wreck an "accident that didn't have to happen"
  
• Victim's father says of safety regulations: "The apathy has gone on too long"
  
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