Well you film in the heart of the city what else do expect.  Here are some videos of what people have caught during the filming of Transformers 3.  Gotta say that Semi Truck looks freaking clean even with all those debris.  I'm still surprised that they allowed people to shoot video.  They also had the people just one block away from the shooting.  Crazy I say.  Now here are videos that people took during filming (action sequences).

Head on over to Gizmodo to view some of the cars they had.