State officials expect the Sumner Tunnel closure to last just one month, reopening by Aug. 5, with additional weekend closures. Daily detours and traffic congestion are expected in Downtown and East Boston areas.
The $160 million Sumner Tunnel project started in April 2022, focusing on tunnel ceiling, roadway, walls, lighting, safety, and climate resiliency. Areas north of Boston will be most affected by the closures.
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