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The Sumner Tunnel will be closed seven days a week from July 5 to August 31. During this time, traffic will be diverted through signed detour routes.
The Sumner Tunnel is undergoing a restoration that began in the spring of 2022. This work requires the tunnel to be closed to traffic periodically.
The Sumner Tunnel will be closed on weekends from Fall 2023 to Winter 2023. During this time, traffic will be diverted through signed detour routes.
The Sumner Tunnel will be closed seven days a week in the summer of 2024 from July to August. During this time, traffic will be diverted through other signed detour routes.
— Mass.gov
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