In 1997, Texas mixed discarded roofing shingles into two 1,000-foot Highway 31 test sections; years later, officials said their performance was comparable to conventional asphalt
Highway engineers in Texas have shown that discarded household roofing shingles can be recycled into durable road surfaces that perform as well as standard asphalt after years of heavy traffic. In 1997, the Texas Department of Transportation (TxDOT) built two 1,000-foot test sections along State Highway 31 in the Dallas District using hot mix asphalt…