1. Ph.D. Candidate, School of Civil Engineering, Iran Univ. of Science and Technology, 16765 Tehran, Iran.
2. Associate Professor, School of Civil Engineering, Iran Univ. of Science and Technology, 16765 Tehran, Iran.
3. Professor and Chair in Transportation, Civil and Environmental Dept., Univ. of Auckland, New Zealand; and Founder and Former Director, Transportation Research Centre, Univ. of Auckland, New Zealand (corresponding author).