The Bureau of Transportation Statistics (BTS), as part of the United States Department of Transportation, compiles, analyzes, and makes accessible information on the nation's transportation systems; collects information on intermodal transportation and other areas as needed; and improves the quality and effectiveness of DOT's statistical programs through research, development of guidelines, and promotion of improvements in data acquisition and use. BTS is part of RITA and is a principal agency of the U.S. Federal Statistical System.