SIT Optibús (officially Sistema Integrado de Transporte Optibús) is a bus rapid transit (BRT) system operating in León, Guanajuato, Mexico. Locally it is known also as "La Oruga" (the caterpillar), due to its use of articulated buses. Most of the Optibús route uses city streets, but with dedicated bus lanes and high-level platform stations. The system was inaugurated on September 27, 2003. León was the first city in Mexico to implement a BRT system. In some respects it is similar to other Latin American BRT systems such as the Mexico CityMetrobús, the GuadalajaraMacrobús, the BogotáTransmilenio, the Guatemala CityTransmetro, and the Monterrey Transmetro.
One of the articulated buses of the León Optibús system, with the system logo. Note the high-level exit doors on the left side of the bus.
León is one of the few cities in Mexico that has a modern, municipally operated bus transit system and utilizes prepaid farecards (known as Pagobús), as opposed to the traditional Mexican pesero system of individual bus owner-operators collecting cash fares. The prepaid farecard system was put in place about four years before the Optibús system.
