Starting Saturday, November 8, Exit 25 off I-93 southbound will no longer provide a secondary route to the Callahan Tunnel, meaning Central Artery motorists must use Exit 24 to get to Logan International Airport and East Boston.

The traffic shift is part of the preparation for the opening of the new I-93 southbound tunnel in the next few months. Exit 25 began providing an additional access route to the Callahan Tunnel earlier this year under a temporary roadway configuration.

The one-lane Exit 25 will continue to provide access to Government Center, but drivers headed to East Boston will now have to continue on to Exit 24 - a two-lane off-ramp that is a mere 800 feet to the south.

"This is a necessary change that will help us continue making significant progress toward the interim opening of I-93 southbound," said Turnpike Authority Chairman Matthew J. Amorello. "We don't anticipate that the elimination of this secondary route to the Callahan will have a serious traffic impact, especially with Exit 24 so close by, but we ask motorists to bear with us during this transitional phase."

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