vehicle and concessions would be eliminated unless they were ecologically friendly vehicles, and in October 2011 the city's Secretary of Mobility Héctor Serrano states that by the end of the current administration (2018) there would no longer by any peseros/microbuses circulating at all, and that new full-sized buses would take over the routes. In 2014, the city launched so-called "Bus Rapid Service", with mid-sized Mercedes-Benz Boxer buses carrying 75–85 passengers painted purple-on-white, replacing 'peseros' on certain groups of routes. Operation is a concession to the private firms (SAUSA, COTOBUSA, TREPSA) instead of to individual vehicle operators. City agency Red de Transporte de Pasajeros (RTP), formerly M1, operates various networks of large buses including regular, Ecobús, Circuito Bicentenario, Atenea, Express, school and night routes. In 2016, more bus routes were added to replace pesero routes. In 2016, the SVBUS express bus service was launched, with limited stops and utilizing the city's toll roads on the second-level of the Periférico ring road and Supervía Poniente and connecting Toreo/Cuatro Caminos with Santa Fe, San Jerónimo Lídice and Tepepan near Xochimilco in the southeast. Suburban buses also leave from the city's main intercity bus stations. Trolleybuses Cable cars Metro Mexico City is served by the Sistema de Transporte Colectivo, a metro system, which is the largest in Latin America. The first portions were opened in 1969 and it has expanded to 12 lines with 195 stations. The metro transports 4.4 million people every day. It is the 8th busiest metro system in the world, behind Tokyo (10.0 million), Beijing (9.3 million), Shanghai (7.8 million), Seoul (7.3 million), Moscow (6.7 million), Guangzhou (6.2 million), and New York City (4.9 million). It is heavily subsidized, and has some of the lowest fares in the world, each trip costing 5.00 pesos (roughly US$0.27) from 05:00 am to midnight. Several stations display pre-Columbian artifacts and architecture that were discovered during the metro's construction. However, the metro covers less than half of the total urban area. The Metro stations are also differentiated by the use of icons and glyphs which were created for the illiterate, a unique system that has become iconic characteristic of Mexico City. Each icon was developed based on historical (characters, sites, pre-Hispanic motifs), linguistic, symbolic (glyphs) or geographic references. A complementary system of icons was used for the Metrobús (BRT) stops. Commuter rail Tren Suburbano A suburban commuter rail system, the Tren Suburbano serves the