The Regional Transportation District celebrated its 40th anniversary on July 1.
Colorado's General Assembly established RTD to develop and operate a mass transit system for the metropolitan area, and in 1973, voters approved a sales tax increase to provide funds for the district. Over the next few years, RTD acquired several independent bus lines to create a unified public transportation agency.
RTD now provides bus and light rail transportation to the metropolitan area. Denver Union Station has been transformed into a transportation hub for bus and light rail lines plus additional light rail lines are planned or under construction including a line from Union Station to Denver International Airport.