According to Wikipedia, “B-roll is supplemental or alternate footage intercut with the main shot in an interview or documentary.”
Need some B-roll? This guy has your B-roll!
[flv:http://www.youtube.com/watch?v=SItFvB0Upb8 https://www.chrisd.ca/blog/wp-content/uploads/2009/12/b-roll-video.jpg 425 300]
If you call the number in the video, you get the Polk County Wisconsin Tourism Information Center. We asked for B-roll and they hung up.