Mexico's controversial new 'superhighway' Piero Zanetti/Getty Images The beautiful Oaxaca Coast is peaceful, fragile and largely undeveloped The 104km Barranca Larga-Ventanilla highway radically reduces travel time to Oaxaca's beautiful and bohemian coast, but are local communities prepared for it? Last December, after living in Oaxaca City, the capital of the eponymous state, for five months, I finally made it this …