WESTPORT — Westporters recently witnessed a minor engineering marvel as a new span for one of the nation’s busiest highways was built overhead and then slid into place.

Click the above image or here to view the time-lapse video of the Interstate 95 bridge replacement over Saugatuck Avenue, from the Connecticut Department of Transportation.

The northbound span work over Saugatuck Avenue caused major traffic disruptions Oct. 20-23, but was completed 14 hours ahead of schedule.

The fun part?

It’ll all happen again Nov. 3-6 when the southbound span will be demolished and its replacement slid into place.

Learn more about the Norwalk-Westport I-95 project here.