1. Associate Professor, Dept. of Civil Engineering, K.N. Toosi Univ. of Technology, 1996715433 Tehran, Iran (corresponding author).
2. Postgraduate Student, Dept. of Civil Engineering, K.N. Toosi Univ. of Technology, 1996715433 Tehran, Iran.
3. Associate Professor, Nottingham Transportation Engineering Centre, Univ. of Nottingham, Nottingham NG7 2RD, United Kingdom.