Public bus service in Beijing is the among the most extensive, widely used and affordable form of public transportation in urban and suburban districts of the city.Public bus service in the city began in 1921. In 2013, the city's primary public bus operator, the state-owned Beijing Public Transport Holdings, Ltd., operated 1,020 bus routes and 22,555 buses and trolleybuses, which logged 1.299 billion revenue kilometers and delivered 4.63 billion rides.