1. Professor, Changsha Univ. of Science and Technology, Chiling Road 45#, Changsha, Hunan, P.R. China, 410076; and Pavement Engineer, Texas Dept. of Transportation, 4203 Bull Creek #39, Austin, TX 78731.
2. Transportation Engineer, Texas Dept. of Transportation, 4203 Bull Creek #39, Austin, TX 78731.
3. Assistant Research Scientist, Texas A&M Texas Transportation Institute, 3135 TAMU, College Station, TX 77843-3135.