1. Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN, USA
2. School of Transportation Engineering, Southeast University, Nanjing, China
3. Visiting Professor, School or Transportation Engineering, Tongji University, 4800 Cao'an Highway, Shanghai, China
4. Edwin G Burdette Professor, Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, USA