 The next year, SR 21 was truncated out of the Augusta area, and SR 4 was rerouted in the city, onto 13th Street.Thus, both highways no longer traveled concurrent with US 25 Bus./SR 28.In 1982, SR 736 was proposed to connect the eastern terminus of the John C. Calhoun Expressway, at 15th Street, with the western terminus of Greene Street, at SR 4 (13th Street).