Begin Your Journey On Interstate 285. Take Exit 51: Take Exit 51 From I-285 West To Merge Onto Bouldercrest Rd. Merge Onto I-20 West: Follow Signs For I-20 West And Merge Onto The Interstate. Exit 51A Onto Ga-139 N/M.L.K. Jr Dr Sw: Take Exit 51A From I-20 West And Merge Onto Ga-139 N/M.L.K. Jr Dr