The French Land Transport Accident Investigation Bureau (Bureau d'Enquêtes sur les Accidents de Transport Terrestre, abbreviated BEA-TT) is an agency of the French government formed in 2004 and charged with the investigation into accidents involving all forms of land transport, including railways, urban guided transportation systems (metros, trams), cable-hauled transport systems, road transport (heavy goods vehicles, and public transport by coach and bus), and canals and other navigable inland waterways. It is headquartered at the Tour Voltaire (FR) in La Défense business district in Puteaux.