That said, Illinois doesn't rank in the top 10 or bottom 10 in Zutobi's Using data from the United States Bureau of Transportation Statistics website, Zutobi says Illinois came in at 29th overall for road quality and studies show conditions have worsened over the past five years. In 2015, 81.6% of the roads were acceptable dipping to 80.8% in 2020. If you think the roads are rough in Illinois, South Carolina took the top "honor" of having the worst roads in America. Coming in at the very bottom with the worst roads in the country is South Carolina. It’s the only state to be scored below 50% on just 4.72, and it has the highest highway fatality rate of 1.83.