1. Professor, School of Highway Engineering, Changsha Univ. of Science and Technology. Chiling Rd. 45#, Changsha, Hunan, P.R. China 410076; and, Pavement Engineering Supervisor, Texas Dept. of Transportation, 4203 Bull Creek #39, Austin, TX 78731. E-mail: dchen@dot.state.tx.us
2. Research Associate, Professor, Univ. of Texas at Austin, Austin, TX 78731. E-mail: mwon@mail.utexas.edu