The Dan Ryan Expressway is the busiest corridor in Chicago, with an average daily traffic count of more than 300,000 vehicles. The project included eight lanes of freeway for six miles that expand to 16 lanes of freeway for four miles and included almost two miles of an elevated bridge section. The total project included 11.47 miles of interstate construction, with retaining walls, frontage road and cross street bridge construction, and deep shafts to facilitate utility relocation.