Traffic stopped temporarily westbound on the Massachusetts Turnpike to adjust lane configuration in Boston for the Comm. Ave. Bridge project.
The shutdown happened between 1 and 2 p.m. and lasted for about 20 minutes, according to MassDOT.
Bumper-to-bumper traffic could be seen on the eastbound lanes due to lane closures early Thursday morning.
Commuters can try and get around the traffic by hopping on Route 9 or Route 20, or taking the Worcester/Framingham MBTA line.
The lane reductions began on Friday as part of the Commonwealth Avenue Bridge replacement project.
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Lanes on the Mass. Pike are scheduled to re-open on August 7, and the entire project is expected to conclude on August 14.