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Big Dig needs $54m light fix

Tunnel fittings must be replaced, officials say

The state’s top highway official says all the light fixtures in the Big Dig tunnels must be replaced, a $54 million effort made necessary by design or manufacturing defects that have led to dangerous corrosion.

The project, expected to begin next year, will cause frequent lane closings in the tunnels for up to two years, a headache for motorists. The work will be done largely at night, with traffic diverted to surface roads.

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