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The Central Artery/Tunnel Project

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The Central Artery/ Tunnel Project ( known as The Big Dig), is recognized as the largest, most complex, and technologically challenging highway projects in the history of the United States. The goals were to significantly reduced traffic congestion and improved mobility in one of the most congested major cities in the United States and help improve the environmental emissions. This $2.6 billion dollar project ended up costing $14.8 billion dollars, and its development took almost two decades to complete. The problem was an elevated 6 lane highway called the Central Artery that ran through downtown Boston. When it opened in 1959, the Central Artery carried about 75,000 vehicles a day, but In the 1990s it carried upwards of 200,000 vehicles, making it one of the most congested highways in the United States.

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