Saying, "We can't keep throwing things into landfills," Illinois Gov. Pat Quinn signed legislation Friday that will help turn old roofing shingles into asphalt for new road surfaces on public projects around Illinois.Like most green initiatives, environmental advantages are just some of the benefits. The ability to reduce costs is an attractive argument for further recycling. With asphalt being created mostly from petroleum, the price savings on raw materials alone is significant. The Missouri Department of Transportation reports approximately $20 million in savings in 2009 by using recycled shingles in their hot-mix.