In addition to its TransMilenio, Bogotá's public transportation is operated by SiTP (www.sitp.gov.co) and consists mainly of servicio urbano (blue buses, nicknamed 'azules,' covering routes not served by TransMilenio), servicio complementario (orange buses; serving routes to and from nearby TransMilenio stations), servicio alimentador (green buses; serving routes to and from TransMilenio portals) and servicio troncal (red buses; basically extensions of TransMilenio lines).
Payment is by smart card, known as tarjeta tullave (www.tullaveplus.com); these can be purchased and recharged at stations and some markets/newsstands. Flat fares, regardless of distance traveled, are COP$2100 to COP$2300. Stops are marked.
There are also servicio especial buses (burgundy in color, or 'red wine' as SiTP refers to them), which serve outlying areas. Occasional older buses known as colectivos or busetas, which do not follow fixed schedules or stop at designated stops, are also seen along major thoroughfares like Carreras 7, 11 and 15 and in La Candelaria. Many of these have been granted 'provisional' status and are being integrated into the SiTP network, while others are being phased out. Fares run between COP$1450 and COP$1600 and can be paid in cash on board.
To help make sense of it all, TransmiSitp (www.movilixa.com/english) is a popular app that coordinates routes between TransMilenio and SiTP. Buses run the length and breadth of the city, usually at full speed if traffic allows.