In March 2003, Massachusetts Governor Mitt Romney proposed to name the tunnel the "Liberty Tunnel". The renovated Dewey Square Tunnel, which was eventually incorporated into the O'Neill Tunnel, was opened in 2005. The northbound portion of the tunnel was opened in March 2003, followed by the opening of the southbound section in December of the same year. This was followed in 1996 by the beginning of construction on the tunnels with the pouring of slurry to build walls, which was preceded by underpinning the expressway. In 1992, construction began on the tunnel, with the relocation of utilities. One challenge for building the tunnel was constructing the project underneath the existing expressway, as well as crippling the city due to the amount of construction involved. Furthermore, the North End was cut off from the rest of the city, which hampered economic growth. It was even projected that, by 2010, there would be 16-hour daily traffic jams that would cost the local economy $500 million annually. ![]() Originally built for 75,000 vehicles a day, the expressway was carrying 200,000 vehicles a day by the early 1990s. Planning for the tunnel began in the mid-1980s, when it was determined that a replacement for the Central Artery was needed. The tunnel is named for Tip O'Neill, former Speaker of the United States House of Representatives, whose constituency included several of the surrounding communities in Metro Boston. It runs from the Zakim Bunker Hill Bridge at its north portal-barely 165 feet (50 m) east of the TD Garden sports facility's eastern corner-to Boston's Chinatown at its south portal. ![]() ![]() It roughly follows the route of the old elevated Central Artery, though the northbound entrance, at the corner of Kneeland Street and Atlantic Avenue, is somewhat east of the southbound exit (at Kneeland and Albany streets) to allow for a reconfigured interchange with the Massachusetts Turnpike. It carries the Central Artery underneath downtown Boston, and is numbered as Interstate 93 (I-93), U.S. Tunnel (colloquially O'Neill Tunnel) is a highway tunnel built as part of the Big Dig in Boston, Massachusetts.
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