1. Head of Research and Development Dept., Pasargad Oil Company, Tondgooyan Highway, Rajaei Shahr, 19395-4598 Tehran, Iran (corresponding author).
2. Assistant Professor, Dept. of Civil Engineering, North Carolina A&T State Univ., 1601 E. Market St., Greensboro, NC 27411.
3. Ph.D. Student, Dept. of Civil and Environmental Engineering, Amirkabir Univ. of Technology, 15875-4413 Tehran, Iran.
4. Associate Professor, Head of Transportation Group, Dept. of Civil and Environmental Engineering, Amirkabir Univ. of Technology, 15875-4413 Tehran, Iran.