These brushes were installed as a tool to help remove invasive plant seeds from shoes. We encourage anyone to use these brushes when they go out hiking. In 2010, Misty McElyea, an intern with the CWMA researched the effectiveness of these boot brushes. You can see an article on the project at:
http://www.dnr.illinois.gov/OI/Documents/May11BootBrush.pdf.