1. Assistant Professor, Zachry Dept. of Civil Engineering, Construction Engineering and Management Group, Texas A&M Univ., College Station, TX 77843 (corresponding author). E-mail: idamnjanovic@civil.tamu.edu
2. Associate Professor, Dept. of Civil Engineering, Transportation Engineering Group, The Univ. of Texas at Austin, 1 University Station C1761, Austin, TX 78712. E-mail: z.zhang@mail.utexas.edu