1. Res. Engr., Michelin Americas R&D Corp., SIS Michelin Rd., Greenville, SC 29605; formerly, Grad. Res. Asst., Dept. of Engrg. Sci. and Mech., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061.
2. Asst. Prof., Engrg. Sci. and Mech., Virginia Polytechnic Inst. and State Univ., 219 Norris Hall, Blacksburg, VA 24061-0219; corresponding author.
3. PhD Candidate, Dept. of Civ. Engrg., Virginia Polytechnic Inst. and State Univ., 200 Patton Hall, Blacksburg, VA 24061-0105.
4. Assoc. Prof., Civ. and Envir. Engrg., Virginia Polytechnic Inst. and State Univ., 102-B Patton Hall, Blacksburg, VA 24061-0105.
5. Sr. Res. Sci., Virginia Transp. Res. Council, 430 Edgemont Rd., Charlottesville, VA 22903.