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In page Big Dig:
"As of April 2012, it appeared that all of the 25,000 light fixtures would have to be replaced, at an estimated cost of $54 million.[5] The replacement work was mostly done at night, and required lane closures or occasional closing of the entire tunnel for safety, and was estimated to take up to two years to complete.[5] As of April 2016, replacement of the light fixtures continued.[citation needed]
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