Ted Williams Tunnel (Third Harbor Tunnel) Boston, Massachusetts Ben C. Gerwick, Inc. 04-047 In an effort to alleviate Boston’s traffic problems the Central Artery/Tunnel Project (CA/T) was initiated by the Massachusetts Turnpike Authority. The project had two major components: • An existing six-lane elevated highway was replaced with an underground expressway directly beneath the existing road, culmin- ating at its northern limit in

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