This bridge construction sequence animation was primarily made using Google SketchUp 8.0 (free version) for the 3D modeling and animated output. Active sections were used extensively throughout the model to create the transitional effects. The rendered final scene was created in Kerkythea Echo 2008 (free software). Windows Movie Maker 5.2 was used for final compilation of video and audio files. Instructions on how to use active sections to enhance the animation of 3D models in SketchUp can be found on the Google SketchUp website and here: http://www.youtube.com/watch?v=khsFvyXLe-Q. The audio track is "Decisions" by Kevin Macleod, as found on the website, http://www.incompetech.com. More information about the US6 Keg Creek accelerated bridge construction project can be found on the Iowa DOT's web page, http://www.iowadot.gov/us6kegcreek/.