Project Guardian was launched in April 2013, after a survey conducted by Transport for London (TfL) reported widespread fear of sexual harassment among women who use London's public transport, and that 15% of female respondents had encountered unwanted sexual behaviour while using public transport, though around 90% of incidents went unreported.[1][2] It is a joint venture between British Transport Police (BTP), which polices the rail and metro networks; the Metropolitan Police Service's Safer Transport Command, which is responsible for policing of buses in most of London; the City of London Police; and TfL.[3][4]