A pesero, combi, micro or microbús is a form of public transport, most commonly seen in Mexico City. Its name derives from the fact that in the beginning of this form of transport a flat fee of one peso was charged per ride.

Servicio de Transportes Eléctricos de la Ciudad de México (STE) is a public transport agency responsible for the operation of all trolleybus and light rail services in Mexico City. As its name implies, its routes use only electrically powered vehicles. It was created on 31 December 1946 and is owned by the Mexico City government. STE is overseen by a broader local governmental authority, Secretaria de Movilidad de la Ciudad de México (SEMOVI)(Secretariat of Mobility of Mexico City), formerly (SETRAVI) which also regulates the city's other public transport authorities, including Sistema de Transporte Colectivo, Red de Transporte de Pasajeros del Distrito Federal and Metrobús, as well as other forms of transportation in the district. STE's passenger vehicle fleet consists exclusively of trolleybuses, light rail, and aerial lift vehicles, and in 2007 its network carried 88 million passengers, of which 67 million were on trolleybus services and 21 million on light rail.