The latest news and top stories on the National Transportation Safety Board. An independent US government investigative agency based in Washington D.C., the NTSB is dedicated to determining the probable cause of civil transportation accidents and issuing safety recommendations. Its main areas of focus include investigating aviation, highway, marine, pipeline, railroad and commercial space incidents. The NTSB is recognised for its impartial investigations and significant contributions to improving transportation safety, preventing future accidents and assisting victims' families.