yep, thats 25 miles (!) of ih-93 that they will be closing, nightly. lots of public transit jewels, too.
"Due to proximity to the Fleet Center, the Orange Line and highway buses will not permit packages onboard larger than 6" x 12" x 4" (about the size of a loaf of bread)." [from this pdf--which, in true t fashion, contains errors that cause acrobat to complain]