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The Thomas P. "Tip" O'Neill Jr. Tunnel (colloquially O'Neill Tunnel) is a highway tunnel built as part of the Big Dig in Boston, Massachusetts.It carries the Central Artery underneath downtown Boston, and is numbered as Interstate 93 (I-93), U.S. Route 1 (US 1), and Route 3.
I-93, US 1, and Route 3 travel through the Central Artery and the O'Neill Tunnel in Downtown Boston, after which point Route 3 exits the concurrency and continues on surface streets. It crosses the Longfellow Bridge on the Boston–Cambridge city line, and transitions into US 3 shortly after an intersection with Route 2A in Cambridge.
The Big Dig was a megaproject in Boston that rerouted the then elevated Central Artery of Interstate 93 that cut across Boston into the O'Neill Tunnel and built the Ted Williams Tunnel to extend Interstate 90 to Logan International Airport. Those two projects were the origin of the official name, the Central Artery/Tunnel Project (CA/T Project).
Thomas P. O'Neill Jr. Tunnel, twin tunnels, 2003, I-93 (in coordination with the Dewey Square Tunnel), Boston. Dewey Square Tunnel, southbound I-93, southbound portion of the Thomas P. O'Neill Jr. Tunnel, Boston; Massachusetts Bay Transportation Authority tunnels in the Greater Boston area: MBTA Blue Line rail tunnel:
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The Dewey Square Tunnel in Boston, Massachusetts, is part of Interstate 93 (concurrent with US 1 and Route 3), 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. [ 1 ]
Rose Kennedy Greenway map detail showing location of North End Parks adjacent to Boston's North End. North End Park (2008) with Canal Fountain in background. The North End Parks are the two northernmost parks on the Rose Kennedy Greenway, built over O'Neill Tunnel in Boston, Massachusetts and adjacent to the neighborhood known as the North End.
In Downtown Boston, Route 1A and Route 3 separate from US 1 to head toward Logan International Airport and Cambridge respectively, and I-93 and US 1 separate just after passing through the O'Neill Tunnel and crossing the Leonard P. Zakim Bunker Hill Memorial Bridge.