The mission of the District of Columbia government's Department of Transportation (DDOT) is to enhance the quality of life for District residents and visitors by ensuring that people, goods, and information move efficiently and safely with minimal adverse impact on residents and the environment. DDOT manages and maintains transportation infrastructure: •Planning, designing, construction, and maintenance for the District's streets, alleys, sidewalks, bridges, traffic signals, and street lights. •Managing and making improvements to the street system to facilitate traffic flow through the District of Columbia. •Managing, with the Department of Public Works as a partner, the removal of snow and ice from the streets. •Coordinating the District's mass transit services, including the reduced-fare program for students using MetroBus and MetroRail.