The idea is, if you don't know what it is, then you don't want it. 8-)
B-roll is that sort of generic footage of the park or of the ride that news producers can roll while the anchor reads the story. Saves us viewers from having to stare at the anchor's ugly mug for the whole piece, and makes the story (supposedly) more interesting. Real "radio with pictures" kind of stuff. Sometimes the B-roll includes one-sided interview "actualities" with officially appointed people giving answers to pertinent questions. By distributing B-roll to the stations, the park can increase its chances of getting a story on the air, because it lets the station do a whole story about the park, and nobody has to work very hard: nobody has to do an interview, nobody has to go to the park and shoot video in the mud...and to the people watching at home, it looks like the station put some effort into investigating this new rollie coaster thingie goin' up at the Po!nt.
Now think about the news you watch on TV. Is it really news, or just VNRs (Video News Releases) provided by people looking for attention and regurgitated by your local affilliate?
Oh, and the VNR probably comes on 3/4" or Betacam SP.
--Dave Althoff, Jr.
(Remember, my sheepskin says I'm a TV d00d...)