Metrobús BRT Line 6 to begin operations by December 2015, Mexico City October 8, 2015 | Latin America News Secretaría de Transportes y Vialidad (SETRAVI) has announced plans to begin commercial operations on the upcoming Line 6 of the Metrobús bus rapid transit (BRT) in Mexico City,... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password