Cover title.Prepared as part of an investigation conducted by the Engineering Experiment Station, University of Illinois at Urbana-Champaign, in coope...
Prepared as part of an investigation conducted by the Engineering Experiment Station, University of Illinois at Urbana-Champaign, in cooperation with the State of Illinois Dept. of Transportation and the U.S. Dept. of Transportation, Federal Highway Administration, Project IHR-91.