In the case of Metrobus, the documentation available on the conditions negotiated for the different bus lines show that the transport authority and regulatory agency have been able progressively to negotiate agreements more likely to allow for financial sustainability (Flores-Dewey and Zegras, 2012). In addition, corridors for trolley bus services running in a dedicated lane (zero-emission corridors) were also introduced recently. A short description of these projects is provided in Table 3.1.