1. Professor, Changsha Univ. of Science and Technology, School of Highway Engineering, Chiling Rd. #45, Changsha, Hunan 410076, P.R. China; presently, Pavement Engineering Supervisor, Texas Dept. of Transportation, 4203 Bull Creek #39, Austin, TX 78731 (corresponding author). E-mail: dchen@dot.state.tx.us
2. Program Manager, Texas Transportation Institute, 501 CE/TTI Building, Texas A&M Univ., College Station, TX 77843. E-mail: t-scullion@tamu.edu
3. Associated Professor, National United Univ., Maio Li, Taiwan. E-mail: ltc6@nuu.edu.tw
4. Transportation Engineer, Texas Department of Transportation, 4203 Bull Creek #39, Austin, TX 78731. E-mail: jbilyeu@dot.state.tx.us