If you’re going to trash prolifers, at least be sure to get the folks who are actually doing this particular campaign.
http://www.youtube.com/watch?v=jszcS4jN3G8
Here’s a segment on the campaign when it was being run in Calgary. You can see the trucks they use.
http://www.youtube.com/watch?v=V61m3RjyvZ8
Here’s an excellent interview with the director of the project, Stephanie Gray.