Heads Up, Commuters! Southbound Tip O'Neill Tunnel Set for Overnight Closure

Boston drivers, mark your calendars and plan ahead! The southbound lanes of the busy Tip O'Neill Tunnel are slated for an overnight closure this Tuesday, August 18, 2025. From 11 p.m. on Tuesday until 5 a.m. the following morning, Wednesday, the vital artery connecting downtown Boston to points south will be temporarily inaccessible to facilitate crucial maintenance work.

This essential shutdown will impact all Interstate 93 southbound traffic flowing through the city.

MassDOT officials emphasize that these temporary closures are a necessary part of maintaining the structural integrity and operational efficiency of the Big Dig tunnel system, ensuring its continued safety and reliability for millions of commuters.

For those navigating the city during these late-night hours, a clearly marked detour will be in effect.

Southbound I-93 traffic will be directed off at Exit 16 (South Station). From there, drivers will be guided onto Surface Road, a familiar route that runs parallel to the tunnel. Motorists can then seamlessly re-enter I-93 southbound at the Kneeland Street on-ramp, bypassing the closed tunnel section.

While the closure is scheduled for overnight, MassDOT advises all drivers who typically use this route during these hours to anticipate potential delays.

Planning an alternate route in advance, if feasible, is highly recommended to minimize disruption to your travels. Stay informed and drive safely!