1. Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, 301 East Dean Keeton Street, Stop C1761, Austin, TX 78712
2. Department of Civil and Environmental Engineering, University of South Florida, 4202 East Fowler Avenue, ENC 2503, Tampa, FL 33620
3. Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
4. Transport System Division, Universidad de Chile, Casilla 228-3, Santiago, Chile