An aerial view of the November removal of the Commercial Street bridge. Time-lapse video from different angles shows just how the crew did it.

One of the biggest projects of the Boston Marathon involves assembling a temporary bridge over Boylston Street, at the finish line.

She said "Yes, we have been taking time-lapse photos of the bridge construction using the webcam we have on the project website.

The bridge removal is part of the Interstate 5 widening project between Kuebler Boulevard and Delaney Road in south Salem.