Quito is the capital of Ecuador. It was founded in 1534 on the ruins of an ancient Inca city. Today, two million people live in Quito. It was the first city to be named a UNESCO World Heritage Site [2] in 1978 (along with Krakow in Poland).
There are 3 independent, 'enclose stations' systems of buses, with very few transfer stations among them. They are very inexpensive (USD 0.25 for a single ride). These lines follow north-south-lines down through the heart of Quito, and they have stations close to La Mariscal where most hotels are located. Take note that there is no tradition of waiting for people to disembark before people board, so this may take some getting used to. The buses are among the cleanest of South America, but still, be aware of pickpockets!
El Trole or The Trolley (Green stations, buses of different colors) run from station La Y in the north to El Recreo in the south. Downtown, it has the closest stations to Plaza Grande.
Metrobus (Blue stations marked with a Q, buses of different colors) run from Universidad Central in America Avenue, next to Prensa Ave, and then to Diego de Vasquez Ave. until Carcelen last station, this is the best bus service for visitors who wants to visit the Mitad del Mundo Monument, because at Ofelia station the public services buses who go to Mitad del Mundo monument waits to make the switching and carry visitors to Mitad del Mundo, USD 0.25 until Ofelia station, USD 0.35 to Mitad del Mundo Monument.
Ecovia (Red buses and stations marked with an e) run from Rio Coca Station (north) to La Marin Station inside the Quito historic Downtown. Serves stations close to Casa de la Cultura and Estadio Olímpico and Quicentro mall.
Information according to WikiTravel.
