National Transportation Safety Board

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In this image released by the National Transportation Safety Board and released Jan. 11, 2013, NTSB Investigator Mike Bauer works inside the Boeing 787 "Dreamliner" airplane under investigation at Boston's Logan Airport on Jan. 8. (Associated Press/NTSB)

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** FILE ** This photo provided by the National Transportation Safety Board shows a post-accident view of the vehicles from a wrong-way collision in Fountain, Colo., on Sept. 24, 2011. Hundreds of people are killed each a year when drivers turn the wrong way into the face of oncoming traffic on high-speed highways, and a majority of the crashes involves drivers with blood alcohol levels more than twice the legal limit, a federal accident researcher said. (Associated Press/National Transportation Safety Board)

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Deborah A.P. Hersman is chairman of the National Transportation Safety Board. (Associated Press)

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National Transportation Safety Board Chairwoman Deborah Hersman discusses in Washington on Tuesday the NTSB's recommendation to ban all cellphone use by drivers except for emergencies. (Associated Press)

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National Transportation Safety Board Chair Deborah Hersman speaks Dec. 13, 2011, during a news conference in Washington to discuss the board's recommendation to ban all cellphone and portable electronic device use by drivers except for emergencies. (Associated Press)

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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)

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A member of the National Transportation Safety Board investigating the emergency landing of Southwest Airlines Flight 812 cuts away a portion of the plane's fuselage on Sunday in Yuma, Ariz. (AP Photo)

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National Transportation Safety Board Chairman Deborah Hersman and Peter Pantuso, president of the American Bus Association, testified Wednesday at a Senate transportation subcommittee hearing on improving the safety of passengers on the country's large buses, or motorcoaches. Crashes in the past decade have taken dozens of lives. (Associated Press)

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National Transportation Safety Board Chairman Deborah Hersman, center, details the aviation accident on Tuesday, Aug. 10, 2010 in Anchorage. The plane crash took the lives of five people including former U.S. Senator Ted Stevens on August 9, 2010 near Dillingham, Alaska. With Hersman are from left, McHugh Pierre of the State of Alaska Department of Military and Veteran Affairs, Colonel Audie Holloway of the Alaska State Troopers and NTSB Investigator Clint Johnson. ( AP Photo/Michael DInneen)

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National Transportation Safety Board (NTSB) member Robert L. Sumwalt asks questions at a meeting on the investigation findings and safety issues of the June 22, 2009 collision of two Washington Metrorail trains, Tuesday, July 27, 2010, at the NTSB in Washington. (AP Photo/Charles Dharapak)

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SAFETY LAST? A photograph depicting the June 22, 2009, collision of two Metro trains in Northeast Washington that killed nine and injured 52 is shown at a hearing Tuesday on the National Transportation Safety Board's findings. (Associated Press)

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An animation video depicting the June 22, 2009, collision of two Washington Metrorail trains which killed nine and injured 52 people, is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, on the investigation findings and safety issues. (AP Photo/Charles Dharapak)

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A photograph depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, during a hearing on the investigation findings and safety issues (AP Photo/Charles Dharapak)

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National Transportation Safety Board (NTSB) Chair Deborah Hersman presides at a meeting on the investigation findings and safety issues of the June 22, 2009 collision of two Washington Metrorail trains, Tuesday, July 27, 2010, at the NTSB in Washington. (AP Photo/Charles Dharapak)

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National Transportation Safety Board (NTSB) investigator Ruben Payan answers questions at a meeting on the investigation findings and safety issues of the June 22, 2009 collision of two Washington Metrorail trains, Tuesday, July 27, 2010, at the NTSB in Washington. (AP Photo/Charles Dharapak)

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An animation video depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people, is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, on the investigation findings and safety issues. (AP Photo/Charles Dharapak)

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Unidentified audience members watch an animation video depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people, Tuesday, July 27, 2010 in Washington, during a hearing at the National Transportation Safety Board (NTSB) on the investigation findings and safety issues. (AP Photo/Charles Dharapak)