On Wednesday, it seems that Transformers 3 production spent its day at the MPEA Busway under Millennium Park. The sequence involved explosions, smoke and flame effects and what appears to be a completed destroyed section of the highway, matching the devastated look that has been the hallmark of many of the Chicago sets. Pixel Rally was at the site and provided a gallery of images both during the day and night of the set and a good look at the Optimus Prime truck and trailer. Below are a few sample images, the rest of the set can be found here.
As for the videos, below are videos from various locations around Chicago, not even sure where but assume the Wacker Drive area. The first three videos may be from the Busway but not clear. Based on the Transformers cars filmed including Optimus with his trailer, this seems to be a continuation of the Nascar vs. Autobots chase scene that marked the first week of filming. Of special note is the third video that shows that the Twins do make it to Chicago. After that we have two more videos that show the rooftop pyrotechnics that were set off on Tuesday night. The last video involves a massive explosion at a third location and the sound of gun fire. If don't feel like scrolling down, the Movie Chronicles have them all.
"Police" reponse to something