Tomorrow is likely to be one of the busiest travel days of the year, and to give motorists a lift, the online retailer Zappos.com has agreed to pay the tolls Wednesday evening at the Allston/Brighton Toll Complex on the Massachusetts Turnpike between the hours of 5 to 7 p.m.

During that period, tolls will be free to all drivers, including those who use a Fast Lane transponder, said Zappos.com, which is known for its apparel and footwear. Normally, the cost of the toll is $1.25 (or $1 for motorists who use the Fast Lane transponder).

Signage will be set up at the toll complex to will alert motorists that their tolls have been paid courtesy of Zappos.com. And for motorists who stop to pay, there will also be a “second, unexpected surprise,” the company said.