No common rules of operation, studies for corridor planning or evaluation procedures for BRT exist for the ZMVM as a whole. Knowledge sharing w'ould have let the experience of Metrobus guide Mexibus (which was implemented after Metrobus had several corridors in operation). For Metrobus, conditions negotiated with incumbent operators were progressively modified to avoid barriers for tariff integration and fleet optimisation across Metrobus lines (Flores-Dewey and Zegras, 2012).