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Big Dig
The
Central Artery/Tunnel Project
(
CA/T
), known unofficially as the
Big Dig
, was a
megaproject
in
Boston
that rerouted the
Central Artery
(
Interstate 93
)—the chief
highway
through the heart of the city—into the 3.5-mile (5.6 km)
Thomas P. O'Neill Jr. Tunnel
. The project also included the construction of the
Ted Williams Tunnel
(extending
Interstate 90
to
Logan International Airport
), the
Leonard P. Zakim Bunker Hill Memorial Bridge
over the
Charles River
, and the
Rose Kennedy Greenway
in the space vacated by the previous I-93 elevated roadway. Initially, the plan was also to include a
rail connection
between Boston's two major train terminals. The official planning phase started in 1982; the construction work was done between 1991 and 2006; and the project concluded on December 31, 2007, when the partnership between the program manager and the
Massachusetts Turnpike Authority
ended.
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