1. Professor of Civil Engineering and Director of RI Transportation Research Center, Univ. of Rhode Island, Bliss Hall #212, Kingston, RI 02881 (corresponding author).
2. Transportation Engineer, Bryant Associates, Inc., 12 Breakneck Hill Rd., Lincoln, RI 02865.
3. Research Engineer, Technical Univ. of Braunschweig, Weberstr 31, 38106 Braunschweig, Germany.
4. Research Associate, Rhode Island Transportation Research Center (RITRC), URI, Bliss Hall #308, Kingston, RI 02881.