The Dewey Square Tunnel in Boston, Massachusetts, is part of Interstate 93, running under the heart of the city's financial district, including Dewey Square. Built in 1959, it was part of Boston's Central Artery freeway construction project of the 1950s. Known to locals as the South Station Tunnel, the Dewey Square Tunnel is of cut-and-cover design, and originally was six lanes wide, with no breakdown lanes.